Demo link is dead.
So to clarify, it does not work in the itch.io client. I think this is because it takes you to the WeTransfer web page, where you have to click ‘I Agree’ to download the file. (I missed that the first time even in the browser).
The itch.io client just says the file is 24K, which is probably the size of the ‘I Agree’ webpage you land on.