I noticed how precise your distance from the dummy had to be to get a good hit, it felt a little bit hard to judge. The stamina also regained a little bit too fast. In a real match, I feel like you could just run away if you lose your stamina. Getting the timing correct with the hook is a little bit hard too, and its the attack that most people will try to use.
Even in the full version, I feel like I'd get bored fast just doing 1 v 1 basic matches. Mini games, tournament brackets or online multiplayer would be cool (I know hard hard online multiplayer is to add to a game, I've tried)
More environments are needed, I'm picturing something like this for some reason (boxing ring from super smash bros)
I really like how satisfying it is to land a hard hit, and the visual style is cool too.
playing felt fun in general