If your taste in indie gaming goes towards the more relaxing side, you will want to check out LOOP, in which you swap puzzle pieces about to make loops. By indie dev John Cullen, it's designed to be "very Zen and focused". Watch the trailer, check out the demo, and if you're interested, have a look at the Kickstarter Campaign (which has a very modest funding goal). The full game will have the finished game will have 100 hand crafted levels of increasing difficulty. LOOP is being developed for PC, Mac and Linux.