I enjoyed this a lot! It's definitely a good start for a puzzle game. As others have said, a couple more levels to pace the difficulty a little more would be good. Maybe a good starting point could be taking the harder levels and removing an element or two/shifting things around a little bit to make an earlier level that's a simpler version that builds up to the next. I've seen some people doing that in other puzzle games. Or, honestly just a couple of unrelated medium difficulty levels could do the trick too! Overall, great job! I'm looking forward to some post-jam update levels!