Its an interesting game, it looks pretty clean, and the sound effects are nice.
I have noticed a bug that if I spam one of the arrow keys (or clicking), the image of the circle gets misaligned, so you can't tell which color it is on anymore. You should definitely try to fix this as soon as possible.
Design-wise, I don't really like how the light pink and dark pink look so similar because it is very easy to confuse them especially when you first pick up the game, but I suppose it wasn't that bad once I got the hang of it.
Since I am using the keyboard, I would really like it if I could press down to make the wave come down instantly so I don't have to wait. And I would like if I could press a key to restart since you have to click on the screen