View difference between Paste ID: je81p7Nc and 9LuvFaLE

 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);
         }
     }
 }