There is a demo. There are a number of controls on the top right, and one is labeled "Demos", though there is only one demo at the moment, and it doesn't seem complete. I suspect this is still very much a work in progress. I seriously doubt the author intended for it to be shown.
My experience exactly. I tried writing my own script and it didn't work, and then I loaded the demo script and it didn't work. I think a screencast would be nice even if it never gets broken again.
