Vectromirror - The Other Side is a co-op game (currently only single player :-P) that each player plays on different sides of the mirror. Any action made on one side affects the mirrored world, so both sides must work together to progress. It was created only in 48 hours, so it still has a lot left unfinished, but further work may be done on it if the community responds positively to the design.
MS Windows, Mac OS X
Tools and Technologies:
Unity (any product)
Used The Unity Pro Gamejam Trial - NGUI - Photon Unity Networking