This was really well designed! It had just the right amount of levels, I think, and the difficulty curve felt good. Some of the later levels took some planning to complete, which was fun. The pixel art is charming, too.
The only major issue was the lack of an undo button; in the earlier levels, it was no big deal, but by the last few (much longer) levels it started to become a nuisance when a single misinput meant I had to restart the level from the beginning. It wasn’t enough to keep me from finishing the game, and it’s an understandable omission for a jam submission, but if you do a post-jam update at some point I’d recommend adding one in.