I forget which computer I was on when I posted that sorry. Most likely Linux Chrome, but I do a lot of browser stuff generally without issue. Might have been a temporary Chrome update.
It works now, cool game. Could you mod the controls to be not quite so close together.. is it meant to be 1 handed ? And then also it's kind of a glitch I think where you can press jab really fast and you just win. Seems like maybe it could use some debouncing