i have no idea about where this game came from, but i used to heavily resedit it to change the values of weapons and modify the levels.

2 player game, 1 on each side of the screen. you are a spaceman with a jetpack and an array of weaponry. you have to shoot the other guy. the screen scrolls up and down. some levels have obstacles. if the screen scrolls away and you are caught on a n obstacle, you die.
that's all i can remember.

anyone remember?

maybe this:
http://www.cs.cmu.edu/afs/cs/project/cmcl/link.nectar/member/airshed/psc...

ah found it:
http://www.umich.edu/~archive/mac/game/space/

made a vid:
http://www.youtube.com/watch?v=ny66iyE6jj0