Canabalt for the C64. I was wondering how feasible this would be, and my guesses were pretty accurate: sacrifice smooth scrolling at lower speeds and ditch parallax. Otherwise, it’s near perfect! My only complaint is that I know it’s possible for the SID to do a more faithful rendition of the, admittedly bloody good, rendition in the conversion.
Update (2012-01-14): Listening to it again, I think I know why it’s not quite right. It sounds like it’s using just two channels, which would explain why it’s not quite as faithful as it might be. Crushing that much into two channels is far from trivial!