Sure! This is the website where you can download the program and there are Docs that tell you about how it works.
Here's the (current) link to the ROM file being served by itch.io. It's on a CDN so it's got a strange looking address. (you can also see it in your browsers developer -> network panel by filtering on "game.gb".
https://v6p9d9t4.ssl.hwcdn.net/html/2314031/web/rom/game.gb
For baerheather: The ROM file is inside the zip file you upload to itch.io, often in a "rom/" folder and labeled "game.gb"
Hope this helps.