Not very intuitive to learn. A health bar and a score meter would have made things much clearer. The description on the jam page sort of helps, but it is always better to put it into the actual game instead. I do like the idea of filling in the gaps instead of the opposite. However, it doesn't really feel like a rhythm game, not even an environmental one. The theme was interpreted in a very liberal way (I'm not sure whether that's a good or bad thing).
I do like the atmosphere of the game. Well done