First I want to say the UI is very nicely put together. I love all the smooth animations that really make it feel properly polished.
The art is also really high quality and I like that each of the suits designs have a unique aesthetic.
Gameplay was an interesting one, I was quite overwhelmed at the start as I didn't realise the bosses would keep doing things while the spinner was stopped so I panicked thinking the whole board was almost entirely red so I would have a much harder time winning. Also for some reason the first time round the coins didn't show up on the first boss (I'm still not too sure what they did anyway).
Once I got to the second boss the first time I realised you can just use the enemies abilities against them by waiting for them to turn lots of the board black before stopping the wheel. Spades pretty much died in one turn thanks to this since I just waited for him to flip the board and did massive damage to him. It sort of feels like I should have been the one using the abilities that turned the board black, even if it was only from a visual standpoint that the player shouts out those abilities. It seemed strange to me that the boss would be helping me out.
Speaking of abilities, I found the ASDF abilities to be completely useless. Why would I want to reverse the spinner or flip the board when I'm the one using the spinner?
Also with the mechanic where waiting longer is supposed to speed up the spinner it only seemed to speed up once and then remained at max speed even after I stopped the spinner and went on to the next spin. So it wasn't really ever worth not just waiting for the maximum multiplier bonus before stopping.
Overall I had a good time with it and really enjoyed how polished the whole experience was. It's also an interesting idea for a game that I'd like to see worked on more!