Cursor keys: move. keeping z or x pressed slows you down which is handy for hard maneuvers z: shoot. shooting consumes energy x: whenever you're low on energy, your ship is equipped with a fusion device. whenever you're near a flying small enemy, you can attempt to absorb it by pressing x. holding x and releasing when the charge meter is right on the small yellow area, allows you to recharge. 2 consecutive max energy recharges, result in a mega bomb.