Post-future Vagabond (Windows/Mac, free) - From Michael Brough, creator of 868-HACK and a handful of other games, Post-future Vagabond is a unique mixture of puzzle, roguelike and arcade game. Starting with a simple beam weapon, collect ammo and deploy it judiciously to crack open blocks and stun enemies for a few turns. Your goal is to survive and make it to the next room, but if you've played a Michael Brough game before, you know that's never as easy as it sounds.
Get Out of My Way I'm Trying to Eat You (Windows, free) - A short, crisp platform game that's all about trickery and insane leaps of faith. You play a small box that gets eaten by things a lot. As you jump around each of the 40 levels, you'll avoid spikes, leap through edges of the screen, and propel yourself upward with twitchy movements, all in the hopes of reaching the exit cube. A very simple experience, but it's just crazy enough to work!
SERENDIPITY (Windows, free) - Surreal, abstract, possibly confusing, but captivatingly beautiful. These words go well with SERENDIPITY, an unusual puzzle game based on the idea of discovering valuable things you aren't necessarily looking for. Controlling your glowing cursor, simply click on nearby objects that are highlighted. When the two collide, things will happen, but you're never entirely sure what. It's a very calming experience that encourages you to let go and forget about goals and winning and all that usual gaming stuff.