Really cool. Made it to level 7 and then I stopped because it was taking too long.
The mechanic is an old one but you explored it a little bit more than it was already done, so nice job about that. I like how you introduced it without talking about it, just putting the player in a level and let him figure out how to move.
The moving enemies are an interesting decision, I don't know if they really fit with the puzzle gameplay, but I guess that comes down to personal design taste