diff --git a/Levels/Scripts/WorldManager.gd b/Levels/Scripts/WorldManager.gd
index cd9626c..4933f1d 100644
--- a/Levels/Scripts/WorldManager.gd
+++ b/Levels/Scripts/WorldManager.gd
@@ -92,16 +92,9 @@ func spawnEnemy(enemyScene: PackedScene, laneToSpawn: int, delay: float) -> void
 	var enemy : PathFollow3D = createEnemy(enemyScene)
 
 	if delay > 0:
-		var enemyTimer : Timer = createTimer(delay)
-		enemyTimer.timeout.connect(
-			func():
-				paths[laneToSpawn].add_child(enemy)
-				enemyTimer.queue_free()
-		)
-		add_child(enemyTimer)
-	else:
-		paths[laneToSpawn].add_child(enemy)
+		await get_tree().create_timer(delay).timeout
 
+	paths[laneToSpawn].add_child(enemy)
 	enemiesAlive += 1
 
 
@@ -113,15 +106,6 @@ func createEnemy(enemyScene: PackedScene) -> PathFollow3D :
 	return PF3D
 
 
-func createTimer(delay: float) -> Timer :
-	var timer : Timer = Timer.new()
-	timer.wait_time = delay
-	timer.one_shot = true
-	timer.autostart = true
-
-	return timer
-
-
 func addMap(mapScene : PackedScene) -> void:
 	var map : Map = mapScene.instantiate()
 	add_child(map)
diff --git a/Towers/Tower.gd b/Towers/Tower.gd
index 36f135a..803f337 100644
--- a/Towers/Tower.gd
+++ b/Towers/Tower.gd
@@ -84,10 +84,6 @@ func _process(_delta: float) -> void:
 		shoot()
 
 
-func get_available_upgrades() -> Array[TowerUpgrade]:
-	return upgrades.filter(func(u: TowerUpgrade): u.isLevelMax)
-
-
 func shoot() -> void:
 	energy -= energy_cost
 	var projectile : Projectile = projectileScene.instantiate()