Thanks for the feedback!
The controls are definitely something I'd like to improve if I were to develop this further. I'd likely give the user to fully use mouse input the whole time and to provide the option of showing the name of the note instead of a color. (but the colors felt better for the vibes...)
I was hoping the audio distortion would be less of an issue with the volume slider, since the volume is secretly capped at 60% of max behind the scenes. But alas, there can definitely still be some issues as the way I implemented the audio is entirely CPU dependent.