Added a touchscreen mode setting, and an AdaptiveButton that will set it's own min size if the setting is enabled. I did not replace all buttons yet, just made sure everything looks consistent. Also smaller theme improvements.

game/autoload/SettingsManager.gd

@@ -36,6 +36,9 @@ var _settings : Dictionary = {
 		"use_vsync" : ProjectSettings.get("display/window/vsync/use_vsync"),
 		"vsync_via_compositor" : ProjectSettings.get("display/window/vsync/vsync_via_compositor"),
 	},
+	"ui" : {
+		"touchscreen_mode" : OS.has_touchscreen_ui_hint(),
+	},
 	"debug" : {
 		"debug_info" : false
 	}
@@ -132,3 +135,4 @@ func set_rendering_vsync_via_compositor(value : bool) -> void:
 	ProjectSettings.set("display/window/vsync/vsync_via_compositor", value)
 	
 	OS.vsync_via_compositor = value
+	

game/scenes/ConnectButton.gd

@@ -21,6 +21,9 @@ extends Button
 # SOFTWARE.
 
 func _ready():
+	if Settings.get_value("ui", "touchscreen_mode"):
+		rect_min_size = Vector2(rect_min_size.x, 40)
+		
 	get_tree().connect("connected_to_server", self, "connected_to_server")
 	get_tree().connect("server_disconnected", self, "server_disconnected")
 	

game/scenes/HostButton.gd

@@ -26,7 +26,8 @@ extends Button
 
 # Called when the node enters the scene tree for the first time.
 func _ready():
-	pass # Replace with function body.
+	if Settings.get_value("ui", "touchscreen_mode"):
+		rect_min_size = Vector2(rect_min_size.x, 40)
 
 #func _pressed():
 #	Server.start_hosting()

game/scenes/Menu.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=23 format=2]
+[gd_scene load_steps=24 format=2]
 
 [ext_resource path="res://ui/theme/ui_theme.tres" type="Theme" id=1]
 [ext_resource path="res://ui/menu/CharacterEntry.tscn" type="PackedScene" id=2]
@@ -19,13 +19,7 @@
 [ext_resource path="res://modules/planets/test_planet/voxel_library/1_main_lib_merger_empty.tres" type="VoxelmanLibraryMerger" id=17]
 [ext_resource path="res://scripts/world_generators/MainPlanetGenerator.gd" type="Script" id=18]
 [ext_resource path="res://scripts/settings/DirectionalLightSettings.gd" type="Script" id=19]
-
+[ext_resource path="res://scripts/ui/AdaptiveButton.gd" type="Script" id=20]
-
-
-
-
-
-
 
 [sub_resource type="VoxelmanLevelGenerator" id=1]
 script = ExtResource( 18 )
@@ -168,6 +162,7 @@ margin_top = 8.0
 margin_right = 261.0
 margin_bottom = 34.269
 text = "Continue"
+script = ExtResource( 20 )
 
 [node name="Renounce" type="Button" parent="CharacterSelectorMenu/CharacterSelector/VBoxContainer/CharacterSelector/VBoxContainer"]
 margin_top = 42.0
@@ -176,6 +171,7 @@ margin_bottom = 68.269
 size_flags_horizontal = 3
 size_flags_vertical = 3
 text = "Renounce"
+script = ExtResource( 20 )
 
 [node name="New" type="Button" parent="CharacterSelectorMenu/CharacterSelector/VBoxContainer/CharacterSelector/VBoxContainer"]
 margin_top = 76.0
@@ -184,6 +180,7 @@ margin_bottom = 102.269
 size_flags_horizontal = 3
 size_flags_vertical = 3
 text = "New"
+script = ExtResource( 20 )
 
 [node name="PlayerDisplays" type="Node" parent="CharacterSelectorMenu"]
 
@@ -268,6 +265,7 @@ margin_right = 253.0
 margin_bottom = 81.269
 size_flags_horizontal = 3
 text = "Create"
+script = ExtResource( 20 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
@@ -277,6 +275,7 @@ margin_top = 89.0
 margin_right = 253.0
 margin_bottom = 115.269
 text = "Back"
+script = ExtResource( 20 )
 
 [node name="ConnectMenu" type="Control" parent="."]
 visible = false
@@ -367,6 +366,7 @@ margin_top = 224.0
 margin_right = 244.0
 margin_bottom = 250.269
 text = "Cancel"
+script = ExtResource( 20 )
 
 [node name="HostMenu" type="Control" parent="."]
 visible = false
@@ -444,6 +444,7 @@ margin_top = 169.0
 margin_right = 244.0
 margin_bottom = 195.269
 text = "Cancel"
+script = ExtResource( 20 )
 
 [node name="OptionsButton" type="MarginContainer" parent="."]
 anchor_right = 1.0
@@ -491,9 +492,9 @@ __meta__ = {
 }
 
 [node name="Connect" type="Button" parent="OptionsButton/Control/VBoxContainer"]
-margin_top = 13.0
+margin_top = 81.0
 margin_right = 120.0
-margin_bottom = 39.269
+margin_bottom = 107.269
 rect_min_size = Vector2( 120, 0 )
 text = "Connect"
 script = ExtResource( 11 )
@@ -502,9 +503,9 @@ __meta__ = {
 }
 
 [node name="Host" type="Button" parent="OptionsButton/Control/VBoxContainer"]
-margin_top = 47.0
+margin_top = 115.0
 margin_right = 120.0
-margin_bottom = 73.269
+margin_bottom = 141.269
 rect_min_size = Vector2( 120, 0 )
 text = "Host"
 script = ExtResource( 12 )
@@ -513,6 +514,7 @@ __meta__ = {
 }
 
 [node name="Button2" type="Button" parent="OptionsButton/Control/VBoxContainer"]
+visible = false
 margin_top = 81.0
 margin_right = 120.0
 margin_bottom = 107.269
@@ -523,6 +525,7 @@ __meta__ = {
 }
 
 [node name="Button3" type="Button" parent="OptionsButton/Control/VBoxContainer"]
+visible = false
 margin_top = 115.0
 margin_right = 120.0
 margin_bottom = 141.269
@@ -538,6 +541,7 @@ margin_right = 120.0
 margin_bottom = 175.269
 rect_min_size = Vector2( 120, 0 )
 text = "Options"
+script = ExtResource( 20 )
 __meta__ = {
 "_edit_use_anchors_": false
 }

game/scripts/ui/AdaptiveButton.gd

@@ -0,0 +1,6 @@
+extends Button
+
+func _ready():
+	if Settings.get_value("ui", "touchscreen_mode"):
+		rect_min_size = Vector2(rect_min_size.x, 40)
+

game/ui/ingame_menu/ExitButton.gd

@@ -22,6 +22,9 @@ extends Button
 
 
 func _ready():
+	if Settings.get_value("ui", "touchscreen_mode"):
+		rect_min_size = Vector2(rect_min_size.x, 40)
+		
 	connect("pressed", self, "on_click")
 	
 func on_click() -> void:

game/ui/ingame_menu/IngameMenu.tscn

@@ -1,9 +1,10 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://ui/theme/ui_theme.tres" type="Theme" id=1]
 [ext_resource path="res://ui/options/Options.tscn" type="PackedScene" id=2]
 [ext_resource path="res://ui/ingame_menu/ExitButton.gd" type="Script" id=3]
 [ext_resource path="res://ui/keybinds/Keybinds.tscn" type="PackedScene" id=4]
+[ext_resource path="res://scripts/ui/AdaptiveButton.gd" type="Script" id=5]
 
 [node name="IngameMenu" type="Control"]
 anchor_right = 1.0
@@ -37,18 +38,21 @@ margin_bottom = 132.0
 margin_right = 147.0
 margin_bottom = 26.269
 text = "Resume"
+script = ExtResource( 5 )
 
 [node name="Keybinds" type="Button" parent="Menu/VBoxContainer"]
 margin_top = 34.0
 margin_right = 147.0
 margin_bottom = 60.269
 text = "Keybinds"
+script = ExtResource( 5 )
 
 [node name="Options" type="Button" parent="Menu/VBoxContainer"]
 margin_top = 68.0
 margin_right = 147.0
 margin_bottom = 94.269
 text = "Options"
+script = ExtResource( 5 )
 
 [node name="Exit" type="Button" parent="Menu/VBoxContainer"]
 margin_top = 102.0

game/ui/options/Options.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=8 format=2]
+[gd_scene load_steps=9 format=2]
 
 [ext_resource path="res://ui/theme/ui_theme.tres" type="Theme" id=1]
 [ext_resource path="res://ui/player_ui/RemoveProfile.gd" type="Script" id=2]
@@ -6,6 +6,7 @@
 [ext_resource path="res://ui/options/OptionCheckboxRow.tscn" type="PackedScene" id=4]
 [ext_resource path="res://ui/options/OptionCheckBox.gd" type="Script" id=5]
 [ext_resource path="res://ui/options/OptionEnumRow.tscn" type="PackedScene" id=6]
+[ext_resource path="res://scripts/ui/AdaptiveButton.gd" type="Script" id=7]
 [ext_resource path="res://ui/options/OptionsSpinboxRow.tscn" type="PackedScene" id=8]
 
 [node name="Options" type="Control"]
@@ -47,7 +48,7 @@ tab_align = 0
 anchor_right = 1.0
 anchor_bottom = 1.0
 margin_left = 4.0
-margin_top = 30.0
+margin_top = 31.0
 margin_right = -4.0
 margin_bottom = -4.0
 size_flags_horizontal = 3
@@ -69,7 +70,9 @@ property_category = "rendering"
 property_name = "viewport_scale"
 property_label = "Viewport Scale"
 min_value = 20
+max_value = 100
 step = 5
+prefix = ""
 suffix = "%"
 
 [node name="Borderless" parent="PanelContainer/VBoxContainer/TabContainer/Video" instance=ExtResource( 4 )]
@@ -122,12 +125,29 @@ property_category = "rendering"
 property_name = "vsync_via_compositor"
 property_label = "VSync Via Compositor"
 
+[node name="Interface" type="VBoxContainer" parent="PanelContainer/VBoxContainer/TabContainer"]
+visible = false
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_left = 4.0
+margin_top = 31.0
+margin_right = -4.0
+margin_bottom = -4.0
+size_flags_horizontal = 3
+
+[node name="OptionToggleRow" parent="PanelContainer/VBoxContainer/TabContainer/Interface" instance=ExtResource( 4 )]
+margin_top = 0.0
+margin_bottom = 26.0
+property_category = "ui"
+property_name = "touchscreen_mode"
+property_label = "Touchscreen Mode"
+
 [node name="Debug" type="VBoxContainer" parent="PanelContainer/VBoxContainer/TabContainer"]
 visible = false
 anchor_right = 1.0
 anchor_bottom = 1.0
 margin_left = 4.0
-margin_top = 30.0
+margin_top = 31.0
 margin_right = -4.0
 margin_bottom = -4.0
 size_flags_horizontal = 3
@@ -153,4 +173,5 @@ margin_top = 439.0
 margin_right = 535.0
 margin_bottom = 465.269
 text = "Close"
+script = ExtResource( 7 )
 [connection signal="pressed" from="PanelContainer/VBoxContainer/Close" to="." method="hide"]

game/ui/player_ui/player_ui.tscn

@@ -431,8 +431,7 @@ margin_left = -331.0
 margin_bottom = 123.0
 
 [node name="Castbar" parent="GUI" instance=ExtResource( 16 )]
-margin_top = 0.0
+visible = false
-mouse_filter = 2
 
 [node name="ErrorFrame" parent="GUI" instance=ExtResource( 4 )]
 anchor_left = 0.5

game/ui/theme/tab_button_bg_stylebox.tres

@@ -0,0 +1,14 @@
+[gd_resource type="StyleBoxTexture" load_steps=2 format=2]
+
+[ext_resource path="res://ui/theme/button_bg_atlas.tres" type="Texture" id=1]
+
+[resource]
+texture = ExtResource( 1 )
+region_rect = Rect2( 0, 0, 13, 14 )
+margin_left = 8.65868
+margin_right = 8.7872
+margin_top = 6.0
+margin_bottom = 6.0
+axis_stretch_horizontal = 2
+axis_stretch_vertical = 2
+modulate_color = Color( 0.772549, 0.772549, 0.772549, 1 )

game/ui/theme/tab_button_bg_stylebox_focus.tres

@@ -0,0 +1,14 @@
+[gd_resource type="StyleBoxTexture" load_steps=2 format=2]
+
+[ext_resource path="res://ui/theme/button_bg_atlas.tres" type="Texture" id=1]
+
+[resource]
+texture = ExtResource( 1 )
+region_rect = Rect2( 0, 0, 13, 14 )
+margin_left = 8.40166
+margin_right = 8.01612
+margin_top = 6.0
+margin_bottom = 6.0
+axis_stretch_horizontal = 2
+axis_stretch_vertical = 2
+modulate_color = Color( 0.807843, 0.807843, 0.807843, 1 )

game/ui/theme/tab_button_bg_stylebox_hover.tres

@@ -0,0 +1,13 @@
+[gd_resource type="StyleBoxTexture" load_steps=2 format=2]
+
+[ext_resource path="res://ui/theme/button_bg_atlas.tres" type="Texture" id=1]
+
+[resource]
+texture = ExtResource( 1 )
+region_rect = Rect2( 0, 0, 13, 14 )
+margin_left = 8.27315
+margin_right = 8.14463
+margin_top = 6.0
+margin_bottom = 6.0
+axis_stretch_horizontal = 2
+axis_stretch_vertical = 2

game/ui/theme/ui_theme.tres

@@ -1,4 +1,4 @@
-[gd_resource type="Theme" load_steps=30 format=2]
+[gd_resource type="Theme" load_steps=33 format=2]
 
 [ext_resource path="res://ui/theme/h_scroll_bar_texture.tres" type="Texture" id=1]
 [ext_resource path="res://ui/theme/button_bg_stylebox_disabled.tres" type="StyleBox" id=2]
@@ -20,6 +20,9 @@
 [ext_resource path="res://ui/theme/checkbox_texture.tres" type="Texture" id=18]
 [ext_resource path="res://ui/theme/checkbox_checked_texture.tres" type="Texture" id=19]
 [ext_resource path="res://ui/theme/dropdown_icon.tres" type="Texture" id=20]
+[ext_resource path="res://ui/theme/tab_button_bg_stylebox_focus.tres" type="StyleBox" id=21]
+[ext_resource path="res://ui/theme/tab_button_bg_stylebox_hover.tres" type="StyleBox" id=22]
+[ext_resource path="res://ui/theme/tab_button_bg_stylebox.tres" type="StyleBox" id=23]
 
 [sub_resource type="Image" id=10]
 data = {
@@ -234,9 +237,9 @@ TabContainer/icons/increment_highlight = null
 TabContainer/icons/menu = null
 TabContainer/icons/menu_highlight = null
 TabContainer/styles/panel = ExtResource( 8 )
-TabContainer/styles/tab_bg = ExtResource( 4 )
+TabContainer/styles/tab_bg = ExtResource( 23 )
-TabContainer/styles/tab_disabled = ExtResource( 5 )
+TabContainer/styles/tab_disabled = ExtResource( 22 )
-TabContainer/styles/tab_fg = ExtResource( 3 )
+TabContainer/styles/tab_fg = ExtResource( 21 )
 Tabs/colors/font_color_bg = Color( 0.69, 0.69, 0.69, 1 )
 Tabs/colors/font_color_disabled = Color( 0.9, 0.9, 0.9, 0.2 )
 Tabs/colors/font_color_fg = Color( 0.94, 0.94, 0.94, 1 )