DestroyByContact_1.cs

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


public class DestroyByContact_1 : MonoBehaviour

{

    public float health_1 =10;

    public void Update()
    {
        if (health_1 < 1)
        {
            Destroy(gameObject);
        }
    }


    void OnTriggerEnter2D(Collider2D other)
    {
 
        if (other.tag == "Boundary")
        {
            return;
        }

        if (other.tag == "Asteroid")
        {
            return;
        }

        if (other.tag == "Ship")
        {
            HealthScript.healthValue = HealthScript.healthValue - 25;
            other.gameObject.SetActive(true);
            Destroy(gameObject);

            if (HealthScript.healthValue < 1)
            {
                other.gameObject.SetActive(false);
            }
        }

        if (other.tag == "Shot")
        {
            ScoreScript.scoreValue += 1;
            Destroy(other.gameObject);
            health_1 = health_1 - 1;
        }

        if (other.tag == "Shot_2")
        {
            ScoreScript.scoreValue += 5;
            Destroy(other.gameObject);
            health_1 = health_1 - 5;
        }

        if (other.tag == "Shot_3")
        {
            ScoreScript.scoreValue += 5;
            Destroy(other.gameObject);
            health_1 = health_1 - 15;
        }

    }
}