A really original concept! The movement is nice, the sound effects are nice and although it's visually simple, it's consistently simple. My main point of criticism is that when the new notes are picked up, the delay feels inconsistent - sometimes they go on the current beat, sometimes on the next.
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thank you for the feedback! i also noticed this while playing. the notes are coded to always spawn on the next beat. but if you collect a note right before the next beat starts, it feels like it was activated in the same (next) beat and can make the game frustrating to play. will look into fixing this :)