There's 2 bits that are the problem. The big room and the very end, where you have to jump on top of the house looking thing. Those 2 bits just don't work like the rest of the game and are really annoying and unfun to play, at least compared to the rest of the game, which I like a lot.
A average level takes me about ~2 minutes to get through, I got stuck a bit on one level, can't remember which rn and it took me about 4 minutes to get through. I just completed the level Dragon and it took me 1815 seconds to get through. A half an hour on a short level. Big open rooms are not this game's strengths and are just grindy to clear, the rest of the game with its short pathways work way better.