fix bug cannot game over or shoot

Assets/Scripts/DestroyByContact.cs

@@ -14,7 +14,8 @@ public class DestroyByContact : MonoBehaviour
     if (gameController == null)
     {
       Debug.Log("Game Controller script not found");
-    } else
+    }
+    if (gameControllerObject != null)
     {
       gameController = gameControllerObject.GetComponent<GameController>();
     }
@@ -26,12 +27,15 @@ public class DestroyByContact : MonoBehaviour
     {
       return;
     }
+
     Instantiate(explosion, transform.position, transform.rotation);
+
     if (other.CompareTag("Player"))
     {
       Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
       gameController.GameOver();
     }
+
     gameController.AddScore(scoreValue);
     Destroy(other.gameObject);
     Destroy(gameObject);

Assets/Scripts/GameController.cs

@@ -85,6 +85,6 @@ public class GameController : MonoBehaviour
   public void ToggleGameOver(bool show)
   {
     gameOver = show;
-    gameOverText.text = gameOver ? "Game Over :(" : "";
+    gameOverText.text = gameOver ? "Game Over" : "";
   }
 }