I found all the crowns, and read all but one of the pages of text. I accidentally clicked one of them before I finished reading it, and apparently there isn't an option to re-read. And once I had found them, no doors could open, so I couldn't get to the door that had asked for them. There were also two times I fell out of the levels maybe the game could detect that and put me back in the last room I had been in, unless of course the entire room is missing the floor (there was a room I walked into and it looked like I just went through the floor). I also think I got lost, although I managed to figure out where I was. I guess each floor could have something on it that you see as soon as you get there, and then when you see it again after going up and down you know you're on a floor you've been on before.
The sound was nice, but maybe a bit boring? And when the ambience/music loops, it kinda feels like it stops and starts again. That would have been less obvious if it had contained some silence in several places, I think. The art looked great, but as I said, I would want each floor to look a bit less like the others. And I like the writing too.