Penumbra Overture for Linux
I just bought Penumbra Overture for Linux, and I'm in the process of getting around to install it. I played the Demo and was totally amazed by the game's atmosphere and physics, game play, all. From what I've seen from the Windows users, most of them are very pleased with the overall experience of the game, so I hope I'll enjoy a good Survival Horror experience... in Linux with this game :D
You can go check it out (the Demo and different stuff like Screenshots and movies) over at http://www.penumbra-overture.com, more games on Linux can only be a good thing!