I can understand that. My wife and I have worked our way through the first 4 worlds. We haven’t attempted every level, but prob done about 80% of each world, and we haven’t skipped any. We both like these sorts of puzzles and we’re stubborn but we have spent >1hr on a few levels.
Never played such a bloody hard puzzle game. Some of the usual techniques like going away and coming back fresh don’t seem to help, you’re just as stuck. If it’s late at night and I’m tired I just have to go to bed, no chance of doing a hard level then. I think what it is is that it very regularly tries to teach you new concepts but not always in an obvious or gentle way. So you either suddenly get it or you don’t and spend ages going round. The other levels that don’t introduce new concepts but just get you to use what you’ve got in the bank, they work.