WildRoot/Assets/Script/Bullet.cs

using UnityEngine;

public class Bullet : MonoBehaviour
{
    public float speed = 8f;
    private Rigidbody rb;
    public GameObject effect;

    public bool isPlayerBullet = false;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        rb.linearVelocity = transform.forward * speed;
        Destroy(gameObject, 3f);
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Shield"))
        {
            return;
        }

        if (other.CompareTag("Player"))
        {
            if (!isPlayerBullet)
            {
                Instantiate(effect, other.transform.position, Quaternion.identity);
                PlayerController pc = other.GetComponent<PlayerController>();
                if (pc != null)
                {
                    pc.Die();
                    GameManager.instance.PlayDeathMusic();
                }
                Destroy(gameObject);
            }
            return;
        }

        if (other.CompareTag("Spawner"))
        {
            if (isPlayerBullet)
            {
                Destroy(other.gameObject);
                Destroy(gameObject);
            }
            return;
        }
    }
}