DestroyByContact.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class DestroyByContact : MonoBehaviour
{
    public GameObject explosion;
    public GameObject playerExplosion;
    public int scoreValue;
    private GameController gameController;
    public int health;
    public GameObject Player;

    void Start()
    {
        GameObject gameControllerObject = GameObject.FindWithTag ("GameController");
        if (gameControllerObject !=null)
        {
            gameController = gameControllerObject.GetComponent<GameController>();
        }
        if (gameController ==null)
        {
            Debug.Log("Cannot find GameController script");
        }
    }

    void OnTriggerEnter2D(Collider2D other)
     
    {
        if (!this.CompareTag("Player"))
        {
            if (other.CompareTag("Boundary") || other.CompareTag("Enemy"))
            {
                return;
            }
        }


       

        gameController.AddScore(scoreValue);
        if (!other.CompareTag("Player"))
        { 
        Destroy(other.gameObject);
        }

        health--;
        if (health <= 0)
        {
            if (this.tag == "Player")
            {
                Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
                gameController.GameOver();

            }

            if (explosion != null)
            {
                Instantiate(explosion, transform.position, transform.rotation);
            }

            
            Destroy(gameObject);
        }

    }


  
}