Fun premise, triying to figure out optimal strategy was also fun, but I wasn't able to finish the game. Dificulty raises too fast, I was able to achieve only one wheel upgrade, and then I spent all time just shooting and died.
Maybe it would be better if I could just hold mouse and not click all the time. Or if you want to stay with your concept, player need to hold mouse on wheel and draw circles on it with cursor, that will eliminate mouse clicking sound and still have some challenge.
Also sound volume setting doesn't work on my computer.