Pretty clever idea. Loved the music stage of the game. Perfect use of the theme-3. Good job
Some suggestions:
1. The platforms are too slippery & small. Please make them bigger and easier to jump on. As the main focus of this game is the puzzle aspect, it would be good if the platforming is not too tough.
2. Please make the music beats more distinguishable, if they are different instruments it would be even better for easy recognition.