The game based on saving the Earth from complete termination by aliens. You are the only one who decided to go against the army of enemy spaceships. Get ready to maintain continuos fire against enemy. Use your agility to destroy a hole bunch of foes. Break through unlimited waves of enemies, fight unpredictable bosses, summon your allies for help. The game has 4 main type of weapons and with a system that allows to upgrade those and equipment as well.