Hello ! I'm interested in speedrunning the game, but not any of the consoles versions nor the Steam one, but the 1996 windows 95/XP port of it called "Super Bubsy". I would like to know how speedrunning it would work, should it be a new category, considered as a separate game or something ? If you never saw any footage or don't know what is this port, here a playlist with a full playthrough of it done by myself https://www.youtube.com/playlist?list=PLaoi7w0jgiQjP0NEVd--26z_w_xUac_lO

I think it should be a separate game

Yeah, that looks like it would qualify as a completely different game. I'm not sure what the process is exactly, but you should be able to request that new games be added to the site somewhere.