The Earth has been destroyed and the only survivors are on a space battleship. Great game where you face waves and waves of enemies. You have two weapons, one is laser cannon that shoots all the time, but it's quite weak. The second is a powerful beam but it takes some time to rotate the ship, because you can shoot it only from the top. Many upgrades are included but you must find the technology at firs. When you lose all the people on board, the game is over.