Game: Knytt Underground
Platform: PC, Mac
No one suggested this one yet right? Heard there was an update coming, so I decided I would get on that and suggest it. I do already own the PS3 version, I'd buy it again for PC if the price was right though.
Edit: You know I nearly forgot that this was just in a bundle and I actually do own it on PC... had a brain fart. Still would be cool to see it here, with all the stellar games we've been getting, not that any are bad, but Pid and now Guns of Icarus, good stuff. This would probably do pretty good as well, Nifflas and his Kyntt games have a pretty big following.