I was actually kinda worried about the solid wall texture. I wanted solid walls in the first level so you could observe the rotation/gravity effect without falling off the map straight away. I left the level-making bit quite late, so I just used the tiles I had on hand, and there were no real solid wall-type ones. Definitely something I would change if I could do it over.
Also visual cues for the gravity effect is a great idea. I was talking with someone about possibly having boxes that move around from the same effect, possibly onto buttons, and having some kind of indicator so you can predict how the environment will change is a necessity for that kind of thing.
Thanks for giving it a try!