Picked up this game on Thursday and am loving it. It's short, only 5 stages (and a bonus high score focused 6th stage), but it's a great experience and very replayable, I still play the original, Rez, to this day:
http://www.youtube.com/watch?v=d5z6Y5xVF_Y&feature=related
http://www.youtube.com/watch?v=d5z6Y5xVF_Y&feature=related