I love the game, thank you for it! But I found what I consider a bug. The rest of my feedback would be preferences.
Bug description !Spoiler warning!
Right now the game is readily won by just button-mashing punches. I don't know if you consider that a bug or not, but it seems counter to the intent of the game. The punch is so fast and frequent it interrupts the kick more reliably than blocking, and Harper takes enough pauses in action that you'll land more hits than her by just punching a lot.
Maybe a delay could be added after a successful block that allows the opponent to counter, or the tail-end of the punch animation could be extended? Maybe a kick where the animation starts before the punch could still successfully hit, so blocking is the only kick defense? That way the kick is still a little harder to execute in terms of being blocked, but can't be countered by button-mashing punches. Hopefully there's an adjustment that isn't too hard to make among those ideas.