I love Mario's big cartoony eyes! Other small details, like the hat movement, as well as the skidding frame (that reminds me of Yoshi) look great too. Check out that Naruto run, too! I feel like I have seen other YI-styled adult Marios before on the internet, but this is probably my favorite take on it so far.
Thinking out loud here, but at this point, the only thing I'd really want would be to see Mario's animation code rewritten entirely. Make him move like a real YI (or Super Donkey) character and detach his feet and head from his body. That'd be so cool, but really difficult to make. I notice that Mario is drawn with no legs, so the YI animation style is preserved a little bit within the 32x32 patch limitations.