Added level selection screen

game/menu/completion_menu.gd

@@ -2,28 +2,39 @@ class_name CompletionMenu
 extends Control
 
 
-@export var next_level : PackedScene
-
-
 @onready var next_level_button : Button = $%NextLevelButton
+@onready var main_menu_button : Button = $%MainMenuButton
 @onready var focus_timer : Timer = $FocusTimer
 
 
+func _get_next_level(remove := false) -> PackedScene:
+	var next_level : PackedScene = get_tree().get_meta(AbstractLevel.NEXT_LEVEL_META, null)
+	
+	if remove:
+		get_tree().remove_meta(AbstractLevel.NEXT_LEVEL_META)
+	
+	return next_level
+
+
 func _on_next_level_button_pressed() -> void:
 	get_tree().paused = false
-	
-	if next_level != null:
-		get_tree().change_scene_to_packed(next_level)
-	else:
-		get_tree().change_scene_to_file("res://game/menu/main_menu.tscn")
+	get_tree().change_scene_to_packed(_get_next_level(true))
+
+
+func _on_main_menu_button_pressed() -> void:
+	get_tree().paused = false
+	get_tree().change_scene_to_file("res://game/menu/main_menu.tscn")
 
 
 func _on_visibility_changed() -> void:
 	if visible:
+		next_level_button.visible = _get_next_level() != null
 		if focus_timer != null:
 			focus_timer.start()
 
 
 func _on_focus_timer_timeout() -> void:
-	if next_level_button != null:
-			next_level_button.grab_focus()
+	if next_level_button != null and next_level_button.visible:
+		next_level_button.grab_focus()
+	elif main_menu_button != null:
+		main_menu_button.grab_focus()