A great character with some cool ideas, and who's going to get even better if the progress posted on Discord is any indication. Alas, I have some criticisms...
•The Boost Mode sound doesn't stop when Boost Mode ends.
•It's still possible to perform homing attacks in NiGHTS stages by pressing spin (normally used to brake), which causes problems if there are enemies nearby due to the camera lock. (Thankfully it doesn't mess with the NiGHTS track as far as I know.)
•Some parts of the custom Tutorial text get cut off due to exceeding the character limit, and in my opinion the tutorial should specialize in demonstrating Jim's abilities instead of being a redo of the vanilla one. Look at Meta Knight's or Cacee's tutorials for inspiration in this regard.