the point of that game is create, share and play.
the foreground and background movement have been used plenty of times in heaps of games, eg. Paper Mario.
The point of the game is to platform too, although they apparently added so much customization that it can become almost anything.
Also, are you sure the original Paper Mario games (like the non-shit ones) used this idea or only Super Paper Mario (it's been a while since I played it but I thought it only allowed 2D environmental movement or 3D environmental movement).