I don't use it for games but, I play Roman Empire its like Travian.
And for when I'm bored I use Autodesks, Sketchbook Express Mobile (its free and pro)
Heres what I made with it (Great time waster)
and then after you clean it up you get something like...
But I made it in 20 minutes so its not pro, but you can make really really amazing things with it!