Your job is to save the world by destroying bosses with your space gun! Press space to fire, and don't touch rocks coming at you or you will lose lives. If your lives run out before the boss's lives do, your dead! Good luck!
Spaceship: https://www.pinterest.com/drball/top-down-spaceships/ Skull: http://img.jpcycles.com/zoom/170-038_A.jpg
