You did a great job pulling off the "arcade" feel of this! The beat-em-up feel also lines up really well with the bold underdog story you're using.
One suggestion I have is moving the center of the mouse circle. I spent a lot of time trying to spin around the player character before noticing that the circle (which you helpfully mentioned in the page, oops) was farther down and to the side. On an arcade machine, your controls wouldn't be directly mapped to the screen, so I could also see moving it completely off to the side.