Pheenix

You are the only hope against the attacking Space Pheenix, and must travel to the alien mothership and destroy it to save the Earth. Before you get there, there are numerous waves of bad guys to be destroyed and an asteroid belt to be navigated through. Finally arriving at the mothership, you must blast your way through the defensive shield to kill the alien queen inside! Once done, you progress to the next, more difficult mothership.