// Function to fire  1. Mashine gun at LMB  or 2. Rockets ar RMB   *(Mashine gun won't damage the boss)
        private void FireRocket(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                playerPlane.fireRocket();
            }
            if (e.Button == MouseButtons.Left)
            {
                playerPlane.fireBullet();
            }
        }