Watch this trailer:
http://www.youtube.com/watch?v=SS4r9Fq3b...r_embedded

In first few seconds you may say that it's simple platform game, but wait a bit more.
You can view and pass each scene in 2D mode and 3D mode, it's cool!
How that guy done that

I did NOT expect this.. That's insanely good! O.o

Reminds me of a concept I had been playing around with since 2010: http://www.youtube.com/watch?v=kFAFgIGwADg

They made it a lot more interesting, though. I find it quite fun bending the rules of "2D" and "3D".

Found a game using a similar system.
You walk in the world in 3D and with the touch of a button, you're a 2D character, walking on the shadows cast onto the level.

http://steamcommunity.com/sharedfiles/fi...earchtext=