I found the controls a bit difficult, especially at first selecting the notes, because i did not read the instructions on the page, only the ones in the help section. The first time i thought that i could not move, or that the player was outside my field of vision. Then i tried the C, G, and E letters on my keyboard until i properly read the instruction on the page.
I understood the logic, then, but until i found them….
I also hit the bug that would allow me to play only a level, returning to the menu each time with the “level complete” sound.
This is a hard game. Feels like a “sadistic VVVVVV” :D