This is a super cute idea that brought to mind games like Dicey Dungeons and Dice Forge. The character designs and art is amazing, and the clicky sound effects of the wheel really brought things to life. I like the idea of customizing your wheel, though I think the starting wheel could be a little more interesting since landing on the black-0 square 50% of the time in the starting battle made things a bit tedious. Perhaps having only one black-0, one red-1, and the rest yellow-1 to demonstrate the effects to the player. I also think the Power function should be turned down a bit and the wheel made "heavier," if that makes sense, so that if I just tap the button quickly then the wheel spins only a little, rather than making a full circuit or more. But otherwise really great game, hope you continue working on this post-launch since I can see a lot of potential!
By the way, we played your game on our stream last night!