I just completed your game with no hints. I think you did a good job balancing the difficulty for a game jam. Overall I really enjoyed playing and was compelled to finish all the levels. Level 17 was my favorite, when I first saw it, I was like WTF and then saw the title and completed it on my first try. I may have spent a little too long playing, because I was being stubborn trying without the hints, but I was rewarded with that ending. I did find the controls a little frustrating as I accidentally move the wrong piece quite a few times and wished for an undo button. Overall great job.