The visuals and UI are really cool. I especially liked the dark background combined with the different accent colors for each character.
However, when I first started playing, I had trouble understanding what I was controlling, how to control it, and what the objective was. Even in Bootcamp, there was initially no opponent, so I tried the controls shown on screen but wasn't sure what I was supposed to be doing.
After adding a dummy and experimenting with the abilities, I gradually understood that the game is about battling other spinning tops. I think a short step-by-step tutorial showing what you control, how basic movement works, and what you're trying to do against an opponent would make the game much easier to get into.
I also had some difficulty reading the shape of the arena. It seemed to be bowl-shaped, but the slope and differences in height weren't very clear to me. Making the terrain shape a little easier to read might also make it easier to understand where and how to knock opponents around.
Once I understood the concept, I liked the idea of battling with different character abilities. The presentation, especially the UI colors and effects, looks great.