Add build directory to .gitignore, create export presets for Web and Windows Desktop, adjust z-index and mouse filter in level_1.tscn, add update_game_state function in level.gd, change main_scene path in project.godot, set rendering method to "gl_compatibility", add LevelSelect and related nodes in main_menu.tscn, create scene_manager.tscn with MainMenu node, implement functionality for menu button selection in main_menu.gd.

scenes/scripts/main_menu.gd

@@ -0,0 +1,38 @@
+extends Level
+class_name MainMenu
+
+@onready var level_select = get_node("%MenuButton")
+@onready var high_scores = get_node("%HighScores")
+@onready var exit_button = get_node("%ExitGame")
+
+func _ready():
+	level_select.get_popup().id_pressed.connect(_on_item_menu_pressed)
+	high_scores.connect("pressed", Callable(self, "on_high_scores_pressed"))
+	exit_button.connect("pressed", Callable(self, "on_exit_pressed"))
+	update_game_state()
+
+
+func _on_item_menu_pressed(id):
+	## Load the appropriate level based on the selection that has been made 
+	Log.pr(id)
+
+	match id:
+		1:
+			# Load level 1
+			SceneMgr.load_scene("LEVEL1")
+			#get_tree().change_scene_to_file("res://levels/level_1.tscn")
+		2:
+			# Load level 2
+			SceneMgr.load_scene("LEVEL2")
+		3:
+			# Load level 3
+			SceneMgr.load_scene("LEVEL3")
+
+func on_high_scores_pressed():
+	## Load the high scores screen
+	Log.pr("High scores button pressed")
+	pass
+
+func on_exit_pressed():
+	# Quit the game 
+	get_tree().quit()