Great game idea, I love the art and the rolling brain is
!
I tried and like bithead said, landing punches feels good.
I didn't know what strategy to play, so I tried block and jab, then block, straight and uppercut but I always ended up with no stamina and getting my ass kicked.
Untill I found out no block was working the best for me so I went full straight, kicking the S key like crazy till I won the title fight.
It's hard to balance this kind of game, I guess, because it's up to the player to make a beautifull fight, only few games are doing it properly => street fighter
I'm thinking maybe you could add a key to go head down and generate low punch.
Also a "finish him" last punch would be very satisfying
I had a good time playing the game though, keep up the good work.