I really like the UI, it's very clean and good looking. My only problem with it would be that the numbers are little too close colorwise to the wheel and don't read instantly. I had troubles reading the text in the thought bubble as well because it disappeared too quickly. Similarly with the newspaper cutscene before the game.
However, I do love the animation of removing the wheel slices. The music is very soothing and enjoyable and the sound effects are nice too. I managed to understand and get a hang out of the gameplay and different upgrades quite quickly.
Overall, the game is very clean and well-made. Good job!