Well, this kind of inspired me. I hate motion blur in everything and the noise this game was applying was also bothering me (actually, my guess is that the noise may be more inclined to be headache inducing.) Why there isn't a setting to turn this off is beyond me. Anyway, in more recent times I've learned that if you use Unity Assets Bundle Extractor you can sometimes remove shaders (and some other things) and games will still work. Note that sometimes they don't handle this so gracefully and outright crash or have other problems. So far Hollow Knight seems to be working for me though. I removed two shaders, one said MobileBlur and the other said something like NoiseAndGrain and it seems to work fine so far. What's more, it really looks a lot nicer to me. That "grain" static effect was just awful and I hated it. It feels like the game is just much clearer and cleaner looking now. I didn't even realize how much worse the noise makes the game look overall until it was gone, but I knew I hated it. EDIT: Oh yeah, and I saw one that said something about bloom and nixed it too. EDIT2: I think framerates have gone up. It seems to run more smoothly without those shaders...
Anyway, here are the modified files if anyone wants to test: https://www.sendspace.com/file/fykuzm
It's just the two files that were modified and nothing else, so you'll probably need to have the same version of the game (the latest one at this time. It says 18.104.22.168 on the download page.) I don't know if any earlier versions might have the same assets files, but I wouldn't assume so. Just extract this archive into the game's data folder. I strongly recommend you backup globalgamemanagers.assets and resources.assets before putting the modified ones in the game's folder because it might just crash at some later point in the game or something. EDIT: 22.214.171.124 update to those two files: https://www.sendspace.com/file/ksktzj
Well, I can't do this with every update, but I'm really curious to see if this helps people with problems with the game.
Another thing you might also try is using SweetFX (or Reshade now) to tweak its looks a bit. I'm keeping it mostly simple on mine. I add just a bit of vibrance (0.15 seems to be the right balance between nice looking and not overdoing it by too much) and LumaSharpen. LumaSharpen makes it cleaner and clearer. One thing I'm suspecting is the extreme contrast with the light around the character versus the shadows elsewhere (and just the plain contrast all around between light and shadow) might be a problem for some. Adjusting lift gamma gain somewhat to make lift and gamma slightly brighter (1.1 for example) and maybe even making gain slightly darker (0.9 for example) might help somewhat. Maybe.
Hey, I found this post today, and both of your links are down in the present time, I'm really interested in this fix and I can't find anything similar anywhere else, I don't know if you get a notification for this but I hope you do!