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IndieGameStand gave away free copies of Dexter to anyone that signed up before their site went live. Well it is now live and the first deal is Escape Goat. The recommended price for the game is $10 but everything is always Pay What You Want on the site.
This is DRM-Free and you can activate it on Desura. The game is not on Steam yet, but there is a greenlight page for it.
There’s a browser based demo available here. (Requires javascript)