Yeah, that C-64 game rocked. It was called PARADROID.

I haven't played with my C-64 emulator software recently, I don't remember whether it ran well under the emulator or not.

Edit, wow, cool link here:

http://ourworld.compuserve.com/homepages/paradroid90/paradroid90/download.html

Gonna check out Andrew Braybook's diary of the making of the game.
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Tony Fabris