It's probably in progress, but a score counter would be slick as heck. Maybe make the boundaries at the edge of the stage a bit more menacing and clearer, I got killed a few times when I didn't think I was close enough to the edge to get offed.
I've also noticed that the fireballs seem kind of... irrelevant? The kamehamea blast charges really quickly and does much more and is accurate, making fireballs kind of obsolete.
Also, making the opponent fly away when you do a non-charged aerial attack is a bit unsatisfying IMO, I'd love to be able to do cool midair attack rushes before they get hit away.