BulletScript l16

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

public class BulletScript : MonoBehaviour
{
    public float speed = 5f;
    void Start()
    {
        //ustawiamy po jakim czasie nas pocisk zniknie
        Destroy(gameObject,3);
    }

    // Update is called once per frame
    void Update()
    {
        //poruszamy pociskiem
        Move();
    }

    void Move()
    {
        //przesuwamy się w górę o naszą prędkość
        transform.position += Vector3.up * speed * Time.deltaTime;
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.tag == "Alien" || collision.gameObject.tag == "AlienBullet")
        {
            Destroy(collision.gameObject);
            Destroy(gameObject);
        }
    }
}