Well for those of you living under a rock Osmos is a small indie game currently for Mac and Windows that one of their developers has finally started the Linux port for and even promised a screen shot very soon for us!
I have personally played the game under Windows and it is brilliant. Relaxing, frustrating as well in parts and definitely very fun. The graphics look really good too.
Here's a shot of it they shared:
QuoteOsmos is 100% DRM and region free.
# Sublime electronic soundtrack by Loscil, Gas/High Skies, Julien Neto, Biosphere, and more.
# Procedural generation: play random versions of any level.
Buying directly from Hemisphere Games entitles you to both the PC and Mac versions for only $10. (As well as the Linux version when it becomes available.)