Asteroid.cs

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

public class Asteroid : MonoBehaviour
{
    [SerializeField] private GameObject _explosionPrefab;
    private SpawnManager _spawnManager;

    [SerializeField] private float _minSpeed = 30f;
    [SerializeField] private float _maxSpeed = 100f;
    private float _rotateSpeed;

    // Start is called before the first frame update
    void Start()
    {
        _spawnManager = GameObject.Find("Spawn_Manager").GetComponent<SpawnManager>();
        _rotateSpeed = Random.Range(_minSpeed, _maxSpeed);
    }

    // Update is called once per frame
    void Update()
    {
        transform.Rotate(Vector3.forward * _rotateSpeed * Time.deltaTime);
    }

    private void OnTriggerEnter2D(Collider2D other) {
        if (other.gameObject.CompareTag("Laser")) {
            Instantiate(_explosionPrefab, transform.position, Quaternion.identity);
            Destroy(other.gameObject);
            Destroy(GetComponent<Collider2D>());
            Destroy(this.gameObject, 0.25f);
        }
    }
}