Very chill and creative concept!
I really like the interface, it was very simple. And I liked the idea of how the world loops around, staying on theme with the jam. Also, the parallax in the first world was a nice subtle touch.
Maybe after finishing a world you can revisit it with more colour options so you can go wild with the textures.
And some quality of life things, like a reset or undo button, would be nice to have.
Great job!