Really Big Sky. Didn't see that coming. For those confused, the other two games are non-Steam BTA downloads.
As for the other two games, Wake is a super cool platformer on a sinking ship, and yes that means you're on a timer. Think the original Prince of Persia, except pretty different as the world slowly floods and drowning seems like a distinct possibility. I'm not overly attached to the other one, Lunnye Devitsy, but Really Big Sky is pretty great as far as arcade games go.
Yup, I only see 1 as well. And no Desura key when the game is on Desura!
The other two show up when you click buy now. They're beat the average bonuses, like the hintbooks were for Geneforge. It definitely should be better advertised, but you should probably update the OP.