A very interesting concept that I think can be developed further.
Very nice and simple graphics, easy to read. The meta-maze idea is very cool but in it's current incarnation has some flaws. My immediate thought on seeing the full maze was "oh sh*t this will take hours", and upon clearing another screen I thought "well how do I even remember where I'm going?". Perhaps a pause/map screen would alleviate this.
However I think instead of a traditional labyrinth maze the concept could be tweaked into a more straghtforward non-linear map, like a metroidvania or zelda dungeon. Reach different areas to open up new ones, etc.