I've been waiting for a Kit mod ever since I found the Surge mod, and I will say that I really like him! His moveset really fits him, essentially being a sonic-y spin on Mario's moveset from Super Mario Sunshine.
The only thing I'm not really a fan of though is the sprites. It's pretty clearly just a pre-rendered 3D model, which doesn't really fit in with the rest of the sprites in SRB2. The water tank HUD could be a bit smaller imo, and maybe could have a bit more detail added to fit in better.
Overall though, the gameplay matters a bit more than the sprites, and I really enjoy the gameplay! 4/5!