Sleep is death is a 2-player game where the 2 people cooperate to make a story. One person controls NPCs, the enviroment, landscape changes, and all that. The other player just controls the player. Basically, there's the player and the man behind the scenes.
http://www.sleepisdeath.net/It's a name your price, with a minimum of $1.75. It's a 2-player only game (no singleplayer/3+player). One purchase comes with keys for 2 players and unlimited access.
