Thanks - appreciate you taking the time to drop some feedback.
There are certainly a couple of levels I'd have probably swapped out for being a little too mean if I'd spent more than a week on it, though at a certain point I guess I spent enough time replaying things that I maybe got a little too good at manipulating the controls - "If I can complete it then it's probably fine" isn't always the best mindset to have when putting together stage designs!