I haven't been able to fully finish any of the sub-worlds yet (the last few puzzles of each one are t o u g h), but I have gotten the credits - And this is a nice variation on the usual mechanics! I dunno what mechanic I like the most. Everything is cool in their own ways, and the exploration of the mechanics seems to be really thorough.
(Also in-edit, the music slaps and fits the tone some of the mechanics seem to imply)