I really like the pixel art! I think the UI could be improved quite a bit, both in terms of design and visual feedback. At the beginning, I wasn't always sure whether it was my turn or the enemy's.
I also think it would be cool if both the player and the enemy had their own wheel. That way, they could have different abilities, and any upgrades you unlock would be reflected directly on your own wheel.
You could also add more meaningful decision-making instead of having everything rely on randomness.
Good job!