Heard about this a couple of hours ago and jumped on it. I'm surprised to see that no one's mentioned it here yet, too. Played it for about an hour and it's pretty good so far.
I don't know why, but I prefer this type of game on a console/with a controller (and yeah, I know I could hook my PC up to my HDTV if I wanted, although I don't have a wireless keyboard/mouse/controller for it), so I'm glad to see this version for as good a price as Steam's sales.
Oh, also, here's an online link: http://marketplace.xbox.com/en-US/Product/Bastion/66acd000-77fe-1000-9115-d80258410b66