As a whole I like the game, but some little touch here and there would be nice...i know your goal is a minimalistic game, but it feels a bit too simple atm.
For example, I struggle to get the hang of landing punches, most of the time I feel i'm just trying my luck, is this also a prospect of realistic? If not maybe a brief explanation in the intro?
Also, I'd argue for a different sfx or HUD indicating critical hit, otherwise I don't see why I can suddenly lose all my health by a normal punch.
And maybe the sportscaster can refer the boxer by name, not just "He's getting too much shots". He seems to always say that when someone took a good beating, whether it's you or your opponent.
You can see the "unrealistic" BOXING by gamedesign for reference, it's also simple, fun and feels polished.
Lastly, i noticed this bug that if you pay your food bill, press the red "Back", then "Continue your career", you have to pay the bill again.