To kill an enemy I have to hit the very middle of the top for it to register. How do I have a larger contact point?

Questions & Answers
1

private void OnCollisionEnter2D(Collision2D other)
{

        if (other.gameObject.CompareTag("Player"))
        {
            Vector2 direction = other.GetContact(0).normal;
            if (direction.y == -1 || direction.y == 1)
            {
                
                player.EnemyKill();
                //GetComponent<Collider2D>().enabled = false;
                Score.Instance.AddHundoPeice();
                Destroy(this.gameObject, 0.1f);

            }
            else
            {   
                other.gameObject.transform.position = sp.lastCheckPointPos;
                checkpoint.dead = true;
                if(other.gameObject.CompareTag("Player"))
                    Lives.Instance.MinusLife();
            }
        }
    }
2

I fixed it.

private void OnCollisionEnter2D(Collision2D other)
{

        if (other.gameObject.CompareTag("Player"))
        {
            Vector2 direction = other.GetContact(0).normal;
            if (direction.y < -0.5)
            {
                
                player.EnemyKill();
                //GetComponent<Collider2D>().enabled = false;
                Score.Instance.AddHundoPeice();
                Destroy(this.gameObject, 0.1f);

            }
            else
            {
                AudioSource.PlayClipAtPoint(aDeathSound, Camera.main.transform.position, 0.8F);
                other.gameObject.transform.position = sp.lastCheckPointPos;
                checkpoint.dead = true;
                if(other.gameObject.CompareTag("Player"))
                    Lives.Instance.MinusLife();
            }
        }
    }