void Update () {
    if (jugador.position.x > transform.position.x)
    {
        transform.position+=new Vector3(velocidad, 0f, 0f);
    }
    if (jugador.position.x < transform.position.x)
    {
        transform.position+=new Vector3(-velocidad, 0f, 0f);
    }
    if (jugador.position.z > transform.position.z)
    {
        transform.position+=new Vector3(0f, 0f, velocidad);
    }
    if (jugador.position.z < transform.position.z)
    {
        transform.position+=new Vector3(0f, 0f, -velocidad);
    }
}