For anyone stuck. the minigame is programmed to be precise with your clicking. Start of slow and gradually increase your speed. Keep your rhythm as the bar rises, but when it doesn't rise, increase your speed slightly. Then let the bar rise, keep your rhythm, then when it doesn't increase, repeat prior steps. If you go too fast, the bar will drop. At this point, try to slow your speed to catch the bar before it goes any lower. Maintain a rhythm and repeat prior steps.
Also, your monitors refresh rate 100% fucks up the minigame. I figured this out the hard way. I opened my Nvidia App and added the game and set it max fps to 60 and the minigame became much easier.