Good idea, and great job on making this as your first game for TDEMO! But I think it could've been executed better!
I think you should make the game slower, and perhaps make it speed up over time, or make different levels where it's at different speeds, it's far too precise to be enjoyable because if you're even a slight bit out you lose your points, I think that would lose you a lot of players in that regard.
The fact that you used strikingly saturated colours along with the high spinning speed could make someone feel uneasy playing the game.
If you fixed the speed and the bright colours of the game and added some soundFX/Music, you could have yourself a nice little mobile game!