Beautiful game but I have a hard time getting the rythm, the music is hard to "read" for me and it feels unrelated to the heart pulse. Maybe an easier track would be nice for the beginning?
Little detail: the RETRY button has to be clicked with the mouse! You were sooo close to a full 1-button game!! It would be great to be able to retry with a long press of the button :)
Other than that, it's a well done game, congrats!!