i don't want to leave a huge review, i think the concept of a knuckles version of SMS is great, however i had some issues with it:
first, a bug: SF_NOJUMPHEIGHT cannot be parsed by srb2 and gives a warning when the addon is loaded (at least in 2.2.10). did you perhaps mean SF_NOSUPERJUMPBOOST?
the quick drop you can do with shift is nice, however it conflicts with the alternative method of jumping off a wall with shift (and it appears you know this already). my only idea to fix this is to allow the player to switch the bind to a custom action button while leaving shift as a default, though i have no idea how difficult that would be to program in.
this is more of a nitpick rather than an issue, but i feel the hudname being CHAOSKNUX makes the name look a bit awkward on the hud. perhaps it could be shortened to something like C.KNUX? (this only applies to the hudname, not any of the other name fields as it's fine there)
besides these things, i feel the character is quite fun to run around as, it's not too unbalanced even compared to the vanilla cast and i would dare say allows the playstyle of vanilla knuckles to compete with some other addon characters
This character has improved a lot and gave me some enjoyment for this version. I find him more fun and fitting with the crew, instead of being an overpowered recolor. I would be picky about his height, but this is like an OVA Knuckles case because he's only there in the comics (If I'm correct). But his speed is a bit high, please tone it down.
Multi-Glide: Ugly Knuckles..? Is that you?!
Spam Dash: The spin dash works almost like adventure, but without the uncurling which is amazing for this case. I love this, and love that you made a pointer to point where the spin dash will go.
Super Stomp: This ability complements his Multi-Glide as he can gain so much height from enemies/quickly get to the ground, it also isn't very snappy which makes it more free to control. Even though stomping as you press spin after a glide is annoying, I know you cannot do anything about it.
Just also want to say I feel like Chaos Knuckles should have NOJUMPHEIGHT flag.
You're improving this character a lot! I love the changes you made with him, and overall fantastic work on making this very enjoyable!
Alright, update huh? See what you did here, removed nuke shield ability. (Thanks god) and added this stomp ability! Great job, he's now only on two buttons, meaning anyone can play him simple but nice. The stomp is pretty nice, although it would be cool if you give Chaos Knux the chance to instantly rev up a spamdash when holding spin after stomp, oh yeah. Spamdash, it's way too powerful! I suggest toning down Chaos Knux's speed a bit, and adding a uncurl to his spamdash, therefore it's not that nauseating to spam the SPAMdash... Another thing is, his stomp ability overrides the spin ability in glide, the one that makes you jump off from a wall without changing the camera angle, this makes it extremely weird. Other than that, great! He's improving.
Key word here is potential.
I think the aimed spindash idea is neat, but the spindash itself is WAY too strong to be used reasonably. A free armageddon shield with 10 rings seems a bit too broken and dash mode honestly just feels tacked on without doing anything notable for him (even if it lets him damage things you may as well give it something extra like aerial preservation or something to help it flow with his moveset better.) Plus, peeking at the sprites, you REALLY didn't have to colorize him. This mod has some good ideas, they just need some fine tuning and tweaks. See the discussion tab for a few ideas I think could help.