 The player's ship has rapid-fire capabilities to shoot down enemies fast and three screen-clearing smart bombs at the start that destroys all current enemies in their radius.As with the original game, defeating all of the aliens in the playfield allows the player to progress into the next level, while failing to protect the miners causes the planet to explode and the level becomes populated with mutants.Surviving the waves of mutants result in the restoration of the planet and the miners themselves.