private void Tick(float deltaTime)
        {
            if (GamestateManager.Instance.GamePhase == GamePhase.Playing)
            {
                foreach (ITickable tickable in Tickables.ToList())
                {
                    tickable.Tick(deltaTime);
                }

                CollisionHandler.Tick();
                GamestateManager.Instance.Tick(deltaTime);
            }
        }