Absolutely fantastic. Perfect interpretation of the restriction, suitable amount of juice. Given the time constraints, I can see how it ended up where it did, but I think if you were to take this further, having the actual strings move with the button presses might add an extra juice 'element'.
Sometimes the timing was a bit 'off' but I think that's just a byproduct of trying to make an entire rhythm game from scratch with a suitable note chart in three days. Beautiful experience, wonderfully executed, well done.