Guide your space shuttle through the cavern, rescue the 8 stranded LGM (little green men) and return them to the docking bay Be careful, don't hit the walls. There is a scoring system in this version of the game. Points are awared for rescuing the LGM, for collecting fuel & extra Lives. Also, if you complete the mission quickly enough you will gain a time bonus. You can shoot certain parts of the scenery to access closed off areas.
This is all my own work apart from the music on the title screen which is a simple loop of guitar & effects taken from the original master recordings of the song "When I Meet God" by Marillion.