Not bad idea!

cool!

wow
at the first level i thought that ita just invisible body, that runs in the real world... but on the second...

Nice idea to use an usual passive scene rendering property as an active game element

That blew me away, I wanna make a shadow game!

*tilts head slightly to the right*
how did they do that?

Very creative idea. I like simple, yet innovative ideas like this.

The guy you controll is actually on a 2d canvas (where the shadows are)
so its basically a 2d game from this perspective.

But the 2D world is generated by the shadows (objects and angle
of light) of the 3D world.
What you need to be able to do is determine where on the wall
(the 2D gamecanvas) there is light, and where is shadow.

I guess he can directly extract that information out of the
rendered texture (shadows) of the wall in the back.
In gamestudio you could do this for example also
(workaorund)
by using a lot of traces from the light to the wall for a "internal" shadow.
-or by directly grabbing that info from the shadow-shader

Wow. I love this. Such an interesting idea for a game.