Wow, this was surprisingly good! I really liked the arcadey gameplay here, and the presentation is super clean. The only real criticisms I can think of are things related to guidance – I didn't even realize at first that the goal was to stand on the red circles for long enough, and I would've liked to know that before I began. I also wasn't sure what the left mouse button "hold" move was supposed to be used for. Otherwise, this is a great start and I hope to see more levels that ramp up the difficulty.