Quite the simple game, I think you made a good try. I really like the idle animation of the player when the enemy gets knocked down, it feels quite polished. But I don't think this fits the theme of the jam very well, since the countdown is only for the KO timer but nothing in the actual gameplay revolves about "count down" that actually matter (there's way too much time before the game time reaches zero, so it becomes insignificant!)
Still the controls are nice and it feels good to play, it just needs more polish and some more gameplay incorpoates well with the theme!