I was fascinated by this Alien-inspired overly violent arcade lightgun shooter as a school kid. I can specifically remember playing it and 'Crude Buster' (also known as 'Two Crude Dudes') on a boat trip with my school. Ah, memories.
I later got it for my Amiga, but never completed it. The music on the title screen of the Amiga version was awesome, though. Composed by Matthew Simmonds, which I know from the soundtracks of Leander, Agony, and Chuck Rock.