Accidental Murder Simulator 2013 is the next game to get access to Valve's library of characters. Today, the game will receive a free Steam update that adds the Medic and the Heavy from Team Fortress 2. If you're familiar with these titles, it should be pretty obvious how these characters will work.
The new content is "inspired" by Valve's Meet the Medic video, and has you attempting to claw your way through the Heavy as the Medic. Hilarity and surgery will undoubtedly follow.