Super fun, despite being simple! Making rythm games are not super easy so good work!
I will note that it is a bit hard to play with the mugs being all the same sprite. I think having some sort of arrow or color difference would help a lot. Also, some sort of UI to indicate where the note hitbox is would be a good addition.
I'm sure you had more you wanted to add though, so feel free to ignore my feedback if you already had fixes in mind! Looks awesome!