void OnCollisionEnter2D(Collision2D collision)
    {
        Vector3 tweak = new Vector3(Random.Range(0f, 0.2f), Random.Range(0f, 0.2f), 0f);

        if (hasStarted)
        {
            GetComponent<AudioSource>().Play();
            rigidbody.velocity += tweak;
        }
    }