Hello! Great game, and one that fits the theme a lot better than most others. I have a love for more minimalistic arcade-based games so I may be a bit biased.
What you did well:
The UI is simplistic and functional.
Controls are EXTREMELY easy to learn. Along with that, once you die a couple of times confused, the game becomes very easy to understand.
The visuals are nice despite being very basic. The wheel is also easy to understand and read.
The gameplay is great! I'd say that for something this simple mechanics-wise you got a lot of content/fun out of it.
My suggestions:
Consider making a genuine tutorial that showcases the effects of everything you explained in the start screen.
Now, I could of just gotten extremely unlucky but this managed to happen twice to me. One major issue in my opinion is the timing of events. I could be wrong but it is physically impossible to keep the slider on the shield at ALL times, especially because of the events. This in itself isn't a problem, the problem is the fact that sometimes 3+ enemies can hit you at the same time, and if your shield goes down right before their impact, you will instantly go from 3 lives to 0. I think the easiest solution to this is to have i-frames. 1, maybe 2 seconds of invincibility every time you're hit will make it so you cannot instantly get decimated the moment your shield goes down.
A bar/indicator of how fast you're spinning compared to the max speed would be nice. I had no idea how much effort I should put into spinning my mouse to make the wheel move at its peak velocity.
If you were thinking about going down a roguelike path, the game has potential for it. Upgrades like less overheating or time-slow or other random buffs could be extremely cool in endless.
Maybe more particles? Make it feel very satisfying when you block a projectile, or scrap particles when you get hit!
Great work, out of the 30+ games I've seen so far, I believe this fits the theme the best out of all of theme, since not only is something spinning in the game, but you literally have to spin your mouse as the only controls to play.