I know a lot of people don't know about this, but there's these indie game developers that offer up several small PC games in a bundle. And you get to name your own price.
I've been following these games for quite a while and have bought a few of their packages. The game work natively in Windows, Linux, and Mac OSX. In the last package they did, they offered up Trine and FrozenSynapse. I got both games, plus 3 more, for just around $15.
This time around, they've got the Voxatron bundle. It's a new arcade-style game where the entire environment is made of destructible blocks. I played it for about 2 hours last night and it was pretty good.
Anyways, there's only like...12 days left to buy the Voxatron bundle. Here's the link to the page: http://www.humblebundle.com
I'll post some screenshots of me playing some of my HumbleBundle games soon. :D