This is a really nice idea and as someone who has always music stuck in his head I can highly relate. Gameplay-wise it took me a long time to figure this out: DO NOT MOVE THE MOUSE DURING PREVIEW. If you move the mouse by just a pixel, you'll loose the preview and this moves from a music guessing game to a "put pieces into a puzzlegame". I'd also prefer a less flashy in-your-face NOPE screen when I got something wrong.
That being said: I very much enjoyed the game, music, artstyle and idea.