Once I had finished going through all the controls and felt like I was understanding all the hexes, I had forgotten that I could rotate them. This experience would definitely benefit from a slow rollout of the different hexes and their rules, just in the very beginning. Also I wish there was a way to quickly know where I left off, because I'm not going to complete all of these in one sitting. It looks like the stars you've achieved aren't necessarily showing up on the level, but do show up in the level complete screen?
All this to say, I really enjoyed this game and want it to be better. The puzzles are great. The polarity switcher is my beloved.