Creative idea! Definitely could be improved a bit and cater to fast-paced reaction-based gaming audience. Something like OSU or Aim Labs. Imagine if there was only one circle on the screen at a time, but if the player took to long to click on it, it would turn into a bomb. If the player clicks on the bomb, they lose points, if they click on a circle they gain points. Add a time limit and increase the rate at which circles turn into bombs, and you have a great game! You could even do something sneaky and instead of spawning a circle, occasionally have a bomb spawn. Since the player is trying to click on the circles as fast as possible (before they turn into bombs), they might actually click the bomb.
P.S. I tried clicking on a bomb and it wasn't clear if I lost or not. Coins stopped spawning, but I couldn't find any way to reset the game. Also, the World Highscore was empty.