See how many of the enemy you can destroy. Move the gun using the left and right arrows. Fire a missile using the spacebar. Don't run out of lives or missiles! A life is lost each time an enemy, or falling debris, hits your gun. Additional lives are earned by shooting several of the enemy. Additional missiles are earned by shooting the spaceship. After shooting an enemy, watch out for the falling debris! (Shooting a plummeting fireball blasts it into rocks... which will also destroy the invaders and/or lose you a life if one hits you).
Press Green Flag twice to get started (Scratch bug?) Left right arrows to move, Space bar to shoot. Hit the spaceship for more missiles! My high score: 198