Ahhh! Controls: Keyboard 1=left, 3=right, 0=fire, O=shield. joystick - none provided, 18 wawes + docking screen (after every 3 wawes). using shield costs fuel, watch out on laser temperature! Tips: Each time you lose a life , fuel is replenished, and current wave of enemies is restarted, so it's a good idea to save fuel, but not if it costs you a life.