Very innovative take on the theme. This feels like it also has some rhythm game potential if you wanted to turn it into something like that - like, placing notes to the beat, and also hopping over them, placing more notes etc.
I had a little difficulty with the controls - I wonder if the placing of notes could also be a keyboard/gamepad control? Just a thought.
Playing it reminded me of the bubble jumping mechanic in Animal Well:
Anyway, great work! Would enjoy an expanded version I think.