I loved the idea! Very simple to understand (kinda) puzzlegame, where it's hard to even rage as you vibe with the rhytm lol, there are some bugs, like when I returned to the home screen and then reselected level 1 it didn't let me play, and also if you click on submit just before the next round you can sometimes skip a level! Nice work, tho, just wanted to let you know about these bugs so you can fix them laterr!
Also the UI should be more reactive to the mouse overing in my opinion, as right now it is veeery subtle, and the loop should show you were it starts, as the first level got me pretty confused, good job again!