Like others mentioned here, we also thought about doing this kind of thing for our game, but we decided to go in a different direction, and maybe add the 2D-3D thing later on as a new ability. ;) Of course, we didn't have time in the end to add it, but maybe we'll add it anyway later on.
Love the aesthetics of the 2D world and the little bit of story. Makes you wonder who that tutorial guy is, and if this is something like Portal, where you're being experimented on by an AI, haha.