If you have time, you can upgrade your project.
You have an awesome instrument and soundscape — you can add other layers to the music to make a band, an accompaniment, or add some beats.
Here are some ideas you could try:
You used colour to play notes in this project. Can you think of other ways you can play notes in Scratch?
Here are some ideas:
Each example project in the Introduction has a See inside link for you to open the project in Scratch and look at the code to get ideas and see how they work.