Drag the icons to the polos and the music will play. Click the "C" button for credits. I figured out characters 7, 8, and 18 are quite soothing on their own, a calm melody to sleep to if I say so myself.
This is my first project, so I had lost most of my motivation to finish it near the end. The characters have the code and such for the animations, along with the code, but I didn't debug it so the animations actually ran.