I defeated the wheel - but it seemed like it was too easy. I barely had to move forward in order to hit it. Maybe the hit box was just a lot bigger than I expected it to be, but it felt much easier to just sit back and click to attack without using any powerups or worry about moving around for anything.
If you continue to tinker with it, it might be good to modify hit boxes, hurt boxes, enemy movement (to go around behind you), and add some music/sound design to get it polished. Some additional levels may also be nice, especially if you want players to use more of the powerups (the game is pretty short as-is).
It's an interesting concept with opportunities!