DestroyByContact2.cs

using System.Collections;
using UnityEngine;

public class DestroyByContact2 : MonoBehaviour
{
    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("Boundary")) 

        {
            Destroy(other.gameObject);
            Destroy(gameObject);
        }
    }
}