I got The Corridor originally from the Humble Bundle Trove. This game is a gem. After playing the trove version I enjoyed the game so much I went to see if it was available on steam. And seriously, for only $2 everyone should try playing it.
The game closes (on purpose) after hitting the orange button. The game itself is simple yet the well thought out and executed commentary during each level is what makes The Corridor so amazing. I'm also very happy with the addition of the Steam Achievements. It let me know about hidden parts of the game I probably wouldn't have known about otherwise.
If you love snark, sarcasm, passive aggression, and strange all in one, then this is a must try.