public class Bullet : MonoBehaviour {

    [SerializeField]
    float Time = 5f;

    void Start ()
    {
        Destroy(gameObject, Time);
	}

	// Update is called once per frame
	void Update ()
    {

	}

    private void OnCollisionEnter2D(Collision2D collision)
    {
        var health = collision.gameObject.GetComponent<Statistics>().Health;
        health -= 1;
        Destroy(gameObject);
    }

}