I'm only leaving four rather than five because, while this mod is incredibly fun and impressive on a technical level, there is always room for improvement. For example...
1. I feel as though Wario's Shoulder Bash and Donkey Kong's Roll would work better if they replaced the Slide Kick rather than the Dive, since it allows them to be used repeatedly more efficiently and allows the use of the Dive both on the ground and in the air rather than only in the air. I implemented this myself as part of my own personal build of the mod, and it works like a charm with the exception of being unable to Shoulder Bash up steep slopes since it forces you into the Slide Kick state.
2. On a related note, there seems to be a brief period where moving while Crouching (AKA Crouch Sliding) allows Donkey Kong to Breakdance, which shouldn't be possible since his Breakdance has been replaced by a Ground Slam in this mod. Also, I feel as though replacing Wario's Breakdance with his Earthshake Punch from Wario Land: Shake It! would be pretty cool and would make both DK and Wario more like Wapeach.
3. Toadette basically just exists and that's it. She's just a worse Toad because even though she's floatier, she seems to have no other ability that compares to Toad's Ground Pound Jump (unless I'm missing something, but I've tried every input I can think of). Maybe a Ground Pound Roll would work?
4. While Waluigi is able to use his Twirl Jump and Yoshi is able to use his Flutter Jump after falling off a ledge, Peach can't use her Float and Daisy can't use her Double Jump, which makes them a lot less viable when it comes to saving themselves from danger compared to Waluigi and Yoshi.
5. Rosalina's Air Galaxy Spin is somewhat inconsistent since it sometimes uses the Dive or the Air Kick, which is inconsistent with the way her Ground Galaxy Spin replaces the Attack Combo and the Dive.
6. Most people on here suggest that Sonic's Spin Dash is very situational and that it should work more like the Adventure games. I disagree, since doing so would completely break the balance of the game by allowing Sonic to go way faster than even Wapeach. Instead, my problem lies in the button that activates it. I feel that it should be activated by tapping A repeatedly while Crouching instead of tapping B repeatedly for multiple reasons. Firstly, removing Sonic's ability to breakdance feels like a crime against nature given his personality. Secondly, pressing Jump while Crouching is exactly how it is used in the Classic games. Lastly, there's no real benefit to Jumping out of a Crouch since the Backflip is unavailable for Sonic. This is another change that I've already implemented myself and it works great.
7. Adding on to the previous point, I feel that moving the Insta Shield & Lightning Jump to A while holding LT in the air and allowing Sonic to Dive in the air again would also be helpful and would again make it more accurate to how it works in the Classic games (with the exception of having to hold LT, but that's a necessary evil to allow the Homing Attack and Air Dash abilities to remain intact).