Simple but fun! And the game looks good for how simple it is.
The only downside I have is that I was sometimes too fast. I would hit the button to rotate the wheel, but until the wheel stops moving it still handles as if the wheel didn't move at all, causing you to lose points.
It would be better if either input was blocked during the turning of the wheel, or if you would calculate the position of the wheel beforehand and handle the color that would be in that spot once the rotation has completed. I would prefer the latter, since that would allow you to really get some fast rotation-click sequences in!