a good start on making a rhythm game, though it would have been better to try and put in the theme as much as possible because I can't see any of it here.
that being said, the rhythm seems easy and kinda doesn't match with both the fighting or the song, maybe for a better experience, have it so that successfully hitting the rythem charges up your punches and having a combo would allow you to punch, make the fighting and rythem go on at the same time.
but overall, this is a good attempt, even if there is no theme, at least you admit that you didn't do the theme which kinda defeats the purpose.