I really like what you did with the theme! I think it all came together really well, both aesthetically and from a gameplay perspective. I especially liked that level where you had to keep shifting gravity to stay between the spikes; I felt it was an appropriate advancement of the game's mechanics. My only suggestion would be to have a clearer outline of which part of the walls constitutes the hole, as I felt it was a bit vague. Otherwise, I think you should continue with it, add a few more levels and new mechanics, and release it as a mobile game!