Here are two more great open source Linux games that you may not have tried yet: VDrift and Secret Maryo Chronicles.
VDrifthttp://vdrift.net/ DEB package available at GetDeb
VDrift is a driving simulator made with a focus on drift racing. It includes 19 tracks and 28 cars.
It's always great to hear about new games. Thanks for the info on VDrift. I found a new shooter too, Sauerbraten, and I have yet to try it out.
Don't forget to write a review about it here!