Great submission! The art and music are very clean and consistent. It was too difficult for me to visualize what the maze looked like by playing only a few minutes, but I guess that is the point. I like the alchemy interpretation but I think your concept is lacking a bit on the shadows side (I also didn't find that in your GDD). That is unfortunate, because I think you could have incorporated that easily within this concept. I really liked the changing backgrounds when changing perspective, that helped a bit with understanding what was going on. One point of feedback:
The icons for the "powers" were not meaningful enough for me.
Nice work!
Oh, and I would also link your GDD in the description of your game page. Just in case the reviewers don't want to press a button that says "download" :)