I've already started fixing the menu buttons. It's something I've been wanting to do, just haven't gotten around to it until now.
Yeah, the characters do each have a unique special move. I may add some sort of section explaining things like that and other game mechanics somewhere in the extras menu.
The character's slope alignment snapping like that is something I've been aware of. I tried fixing it early on but couldn't find a proper fix that looked right. It's something I'll probably go back and look into again once more important things are done.
The floating hoops give you +200 points. It's not really clear right now but I did request a batch of additional lines from the voice actors so they'll have a line attatched to that soon.
Thanks for playing! :)