Not bad
The animation isn't as smooth as it could be, the energy bar doesn't fill up near fast enough considering how essential it is, so you might wanna increase that a bit. It'd definitely be nice if you could actually do a combo or two, because punch, punch, punch, over and over, going so slowly, is annoying. And if you're going to have a kamehameha wave, you should atleast make it look like one, instead of just a weak little energy ball. And finally, the boss took WAY too long to kill, considering how easy it was, though that too ties to how slow the energy bar filled up.