-Superbrothers: Sword & Sworcery EP
-Amnesia: The Dark Descent
And recently added (cinching this as a better gaming deal than even Valve's legendary Orange Box):
-Super Meat Boy
You also get all the soundtracks. The Superbrothers soundtrack alone costs 8 bucks, and it's well worth that.
But less than a week remains! So do not dally, my friends, nor dilly. If you must wait, then let it be only to allow Bastion's narrator to massage your eardrums.