Asteroids clone. Use arrow keys to move and SPACE to fire. The big green bar shows your ship’s power, which is depleted by impact on your shields and by the use of your blaster. If you spin your ship very quickly, it can fire a devastating spray of bullets, but you must use this feature sparingly as it consumes a lot of energy. If the green bar disappears completely, the slightest impact will vapourize your ship. Blasting the smallest fragments will leave green dots behind which you can collect to recharge your ship.