private void Start()
    {
        if (instance == null)
        {
            instance = this;

            audioSource.Stop();

            InvokeRepeating("AddMorePizzaOverTime", 0f, 2f);
            StartCoroutine(AddMorePizzaOverTime());

            pizzeriaText.text = "+" + remainingPizzas.ToString();
            LevelController.instance.onGameStart += OnGameStart;
        }
        else
        {
            DestroyImmediate(gameObject);
        }
    }
 // Start is called before the first frame update
 void Start()
 {
     score    = 0;
     pizzeria = GameObject.FindGameObjectWithTag("Pizzeria").GetComponent <PizzeriaController>();
     pizzeria.MakeAPizza();
 }