Luckily, developer Marc ten Bosch's mind-bending game was on display at this year's IndieCade 2010 festival, and I got a chance to try out the high-concept title for myself. I'll do my best to explain my experience without making your head explode.
At first, Miegakure seems like a fairly standard (though attractive) three-dimensional platformer. In the recent build that I played, moving your character around is performed via the ubiquitous "WASD" controls and a jump button. You can also press "Enter" to rotate the environment for a better view of the action. Another button allows you to remove height, width, or depth from the world's three standard dimensions, at any time.
There's a "hub" world littered with entry points to various levels, and populated with the occasional non-player character who will clue you in to your objective. Map scrolls can also be collected. Once obtained, each map displays a separate spatial dimension of the playing area. Early objectives typically involve manipulating the environment so that you can reach a specific location in each level.
Sound interesting and confusing? Head on over to Indie Games Channel for some more information about Miegakure, a brief clip of the game's latest build in action, and some quotes from developer Marc ten Bosch, himself.
I think you might have oversimplified it to the extreme with this summary; it doesn't sound any different than other platformers the way it's described in this article. We're talking about a game with a button that rotates your camera 90 degrees into the fourth dimension :)
I got to see it at a Super Happy Dev House meetup and it's awesome... and totally mind-breaking. I can't wait for it to be released.