Cute game! A very simple idea that's well executed upon. I like the dual purpose design of attacking and moving with the punch.
A bit more responsiveness to the controls (like automatically changing the spin direction when hitting something while it spins, maybe with a bit more of a sense of momentum and some self-knockback, a faster top-speed when the spin accelerates, changing spin direction being a little more reactive, maybe being able to counter punches with your own punch...) could make the experience maybe even more enjoyable!
Nice touch having the controls for each players displayed in the sidebars :)
Great job!