Scriptum/Assets/BreakOre.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BreakOre : MonoBehaviour
{

    public string name;
    public string name2;

    public Sprite[] sprites;
    private int oldSprite;
    private int newSprite;
    private List<int> availableSprites = new List<int>();
    public ParticleSystem breakParticleSystem;
    public bool timeToBreak = false;

    public int isBroken;

    void Start()
    {
        oldSprite = 0;
        for (int i = 0; i < 2; i++)
        {
            availableSprites.Add(i);
        }

        int continued = PlayerPrefs.GetInt("continued");
        if (continued == 1)
        {
            isBroken = PlayerPrefs.GetInt(name2);
        }
        else
        {
            isBroken = PlayerPrefs.GetInt(name);
        }
        if (isBroken == 1)
        {
            gameObject.SetActive(false);
        }

    }

    IEnumerator Timer()
    {
        if (timeToBreak == true)
        {
            isBroken = 1;
            gameObject.SetActive(false);
            PlayerPrefs.SetInt(name, isBroken);
            Debug.Log("drop item");
            // drop item
            gameObject.GetComponent<GoldOre>().DropItem();
        }
        yield return new WaitForSeconds(1);
        var em = breakParticleSystem.emission;
        em.enabled = false;
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.tag == "AttackHitbox")
        {
            var em = breakParticleSystem.emission;
            em.enabled = true;
            breakParticleSystem.Play();
            if (oldSprite == 0)
            {
                newSprite = availableSprites[1];
                oldSprite = 1;
                GetComponent<SpriteRenderer>().sprite = sprites[newSprite];
            }
            else if (oldSprite == 1)
            {
                timeToBreak = true;
                StartCoroutine(Timer());
            }
            GetComponent<SpriteRenderer>().sprite = sprites[newSprite];
            StartCoroutine(Timer());
        }

    }

    public void SaveCheckpoint()
    {
        PlayerPrefs.SetInt(name2, isBroken);
    }
}