Nitpick away! These sort of comments are always helpful.
The lack of a menu was down to time, but it seems to be a heavily requested feature so I'm going to work on it for post-jam.
The different styles of floor has also been mentioned by a few people. I originally wanted to have different level "groups" each with its own floor tile set, but doing that with 10 levels seemed a bit pointless so I just chucked them all in. I'll probably still split them up as planned, however I'll need to come up with some alternate system of highlighting paths I want the user to pick up on.
No fail animation was another time thing, I originally wanted some sort of effect that would play when a rewinded move occured, with a variant for blocked movments, but I didn't consider it essential for the jam.