Bastion

I know a good number of us are playing it. Darn Beautiful and fun single player game.
Here's one fo my evil, second play through, screenshots:
http://cloud.steampowered.com/ugc/578932219468380572/A57A77D4BF738BC3F280F18DBFF28460170C8D08/
Steam isn't letting me hyperlink the image, but the link works well enough.

Here's the store page if you haven't checked it out yet:
http://store.steampowered.com/app/107100/
Well worth it's $15 price tag, IMO. If in doubt, there's a demo.
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Advocating the end of the world since July 1995.

the narration and music were top notch, these guys deserve your $15 bucks. gameplay is reminiscent of old school zelda, etc.