Ok Ok, this game is an easy top tier. It's simple but you don't feel like it needs a lot more, ESPECIALLY since it's a jam game. I like the art, it's really great (reminds me alot about punch out) but more than that i like the feel it gives, you really feel good every time you get a perfect parry.
I really hope that you update this game after the jam is over. I could definitely see more boxers added that use different styles of boxing which would force you to switch up your playstyle like for example if you fought against a slugger you would need to do parry every attack or you'd get blown of the chain.
Keep up the great work!