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Assets/Scripts/BulletMovement.cs

@@ -4,20 +4,23 @@ using UnityEngine;
 public class BulletMovement : MonoBehaviour
 {
     public float moveSpeed = 10;
+    public float lifeTime = 2;
+    private float _currentTime = 0;
 
-    // Start is called once before the first execution of Update after the MonoBehaviour is created
-    void Start()
+    private void OnEnable()
     {
-        
+        _currentTime = lifeTime;
     }
 
     // Update is called once per frame
     void Update()
     {
         transform.Translate(Vector2.up * (Time.deltaTime * moveSpeed));
+        _currentTime -= Time.deltaTime;
+        if (_currentTime <= 0)
+        {
+            gameObject.SetActive(false);
+        }
     }
 
-    private void OnTriggerEnter2D(Collider2D other)
-    {
-    }
 }