Added level selection screen

game/levels/abstract_level.gd

@@ -2,6 +2,10 @@ class_name AbstractLevel
 extends Node2D
 
 
+const NEXT_LEVEL_META = "next_level"
+const CURRENT_LEVEL_INDEX = "current_level"
+
+
 @onready var pause_menu : PauseMenu = $%PauseMenu
 @onready var game_over_menu : GameOverMenu = $%GameOverMenu
 @onready var completion_menu : CompletionMenu = $%CompletionMenu
@@ -27,3 +31,10 @@ func _on_level_end_entered(body: Node2D) -> void:
 	if body is Player:
 		get_tree().paused = true
 		completion_menu.show()
+		
+		var level_index : int = get_tree().get_meta(AbstractLevel.CURRENT_LEVEL_INDEX, 0)
+		get_tree().remove_meta(AbstractLevel.CURRENT_LEVEL_INDEX)
+		
+		if SaveManager.completed_levels <= level_index:
+			SaveManager.completed_levels = level_index + 1
+			SaveManager.save()