Having monetization turned on on a Jam-game is a bit silly and a huge red flag, you could have at least waited until the Jam itself is over before enabling that
Also, movement in this game is a bit too stiff, something you don't want in a game like this where timing with avoiding attacks matters. Also, this game is very short, and very simple. It is a neat idea, and a unique idea at that. Also very creative take on the Jam's theme, and there should be more PunchOut-like games out there. But this leaves plenty to be desired
Also x2: A game as simple as this should 100% be playable in a browser