I wrote up some more instructions and tried to lay out the nodes more neatly on the screen. Thank you for all the feedback.
As for it not being a game, ironically, you've described exactly how it actually is a game. Except, it's not explicitly telling you to make a certain sound. You have to imagine a sound in your head and the puzzle is realizing it. It's a sandbox game, like Minecraft or something. A space to explore and create within.