Yeah I’d say there is a bit of a… difficulty transition around stage 21 or so. 21, 22 and 23 all took me a good amount of time to figure out with me currently stuck at 24 for the moment (I don’t skip unless it becomes disastrously hard). I will say you do a really good job of capturing that “gah I’m stuck one move away from this working” feeling with these puzzles.
Anyways gonna probably slot this in as my current “pick away” at puzzler and hope to get through a puzzle or two a day (of course I likely just jinxed myself to getting stuck on 24 for a while now with that). I’ll make sure to note when I either finish it up or it breaks me 