As a pop phenomenon, I can see why this could take off, become kind of viral.
As a concept book on simple subtraction, it works. The cat's "it's all good" attitude and standard coolness provides some subtle humor as he loses his buttons in random settings. Overall there's not much here. The return to the refrain, the song, provides a decent moment for imagining what the tune would be like and how it would sound being sung instead of read as prose.
But then I see that they want me to download the song, which would provide 'the answer' for almost the only point where my imagination is being drawn on. Don't download it, or you'll lose the only opportunity for fun thinking in the book!