What seems tranquil and calm from Earth is actually a furious space, featuring endless battles between aliens, spaceships and heroes sacrificing their lives. Follow up the story-line to unlock the endless mode, reserved for skilled players and granting the weakest won't frustrate themselves. The attack comes out automatically, while the movements are easily made with the Mouse, which points the direction the ship must go. Shoot down the many aliens and big bosses, always arriving in waves, and use Space-bar to use the goods they drop to buy upgrades. Make this war machine the universe's strongest weapon in the hands of mankind.