Yeah from what I've heard 90% or so of HK is fine, and it's the remaining 10% that's a true ball buster. Though some of it is probably optional if you're fine with skipping "good endings" and whatnot.
I don't know why I can't vibe with platforming, but for me it just doesn't give me any dopamine at all. Which is a problem as an ADHD sufferer. Combine that with me being pretty bad at it and platforming games just lead to me being angry and frustrated.