Simple, yet effective.

Nice simple game. Good starting point.

It get a bit boring once you know the pattern to stop to block, able to get perfect x5 in a row multiple times in the same game.

A few feature you could add is increase speed when you hit a set level, increase point rate when getting perfect in a row,

I think adding music would be good but I really liked playing this game!

Cool concept.
You could change the background though.
I think it needs to show when to click, like some sort of accuracy detector.
Well done
Good Luck further.

I don't have much to say.
Good game to help you improve your timing.
Good work!