ZigZagShip.cs

private void StartZigZag()
    {
        transform.Translate(Vector3.left * velocityMovimentEnemy * Time.deltaTime);
        transform.Translate(Vector3.up * velocityMovimentEnemy * Time.deltaTime);

        if (transform.position.y >= m_LimitDistanceMax)
        {
            print("Start down");

            transform.Translate(Vector3.down * velocityMovimentEnemy * Time.deltaTime);
        }
        
        if (transform.position.y <= (m_LimitDistanceMin))
        {
            print("Start Up");

            transform.Translate(Vector3.up * velocityMovimentEnemy * Time.deltaTime);
        }