GameManager x Giada

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using System;

public class NuovoGameManager : MonoBehaviour
{
    [SerializeField] GameObject cuore1;
    [SerializeField] GameObject cuore2;
    [SerializeField] GameObject cuore3;

    bool eLaPrimaVoltaCheEntriNelLivello = true;
    //Il vero e proprio "Dio", visibile a tutti ed usabile da tutti
    public static NuovoGameManager istanzaDellaClasseNuovoGameManager;

    public int vitaPlayer = 3;

    private void Start()
    {
        DontDestroyOnLoad(gameObject);
    }

    private void OnEnable()
    {
        //Verifica se esiste un'altra istanza del GameManager nella scena
        if (istanzaDellaClasseNuovoGameManager!= null && istanzaDellaClasseNuovoGameManager != this)
            Destroy(gameObject);
        else
            istanzaDellaClasseNuovoGameManager = this;

        DontDestroyOnLoad(this);

        SceneManager.sceneLoaded += OnSceneLoaded;
    }

    private void OnSceneLoaded(Scene scenaCorrente, LoadSceneMode arg1)
    {
        switch(scenaCorrente.name)
        {
            case "TestGiada":
                cuore1 = GameObject.FindGameObjectWithTag("Cuore1");
                cuore2 = GameObject.FindGameObjectWithTag("Cuore2");
                cuore3 = GameObject.FindGameObjectWithTag("Cuore3");

                AggiornaCuori();
                break;
        }
    }

    public void AggiornaCuori()
    {
        if (eLaPrimaVoltaCheEntriNelLivello)
            vitaPlayer = 3;

        else
            vitaPlayer--;

        eLaPrimaVoltaCheEntriNelLivello = false;

        switch (vitaPlayer)
        {
            case 0:
                cuore1.SetActive(false);
                cuore2.SetActive(false);
                cuore3.SetActive(false);
                break;

            case 1:
                cuore1.SetActive(true);
                cuore2.SetActive(false);
                cuore3.SetActive(false);
                break;

            case 2:
                cuore1.SetActive(true);
                cuore2.SetActive(true);
                cuore3.SetActive(false);
                break;

            case 3:
                cuore1.SetActive(true);
                cuore2.SetActive(true);
                cuore3.SetActive(true);
                break;

            default:
                Debug.LogError("Errore, la vita non è normale");
                break;
        }
    }
}