I get you, that is a lot of input. and everything you said was correct. I know exactly what you're talking about with the wall jump and the sax, it was definitely a design flaw, you must have been soft locked in that room. Invincibility frame is something I didn't even think of, I understand why it could be frustrating when dying a lot. Lack of guidance when reviving I get you.
I think you get a lot of the corner cases in the game that I haven't accounted for, but that's really good to know. I will definitely try to tweak the soft-lock situation for future players. Your feedback was very informative and I truely appreciate it! Many thanks!!