Help this desperate defender to have this planet clear from invaders coming from outer space, shooting with a gun on a small world. This place has a very special structure, being formed by rare minerals. Its inhabitant, the defender that is a protagonist in the action game, doesn't care about it and only wants to live in peace. From the sky, aliens will land on this big ball with an atmosphere and suck out all its energy if he doesn't defend it. Be quick and don't let its reserves be all dredged or else the whole little planet will collapse.