Yeah, it turns out that hosting expires automatically after a week. The IFDB page for the game will eventually have the ability to play online at some point in September, but for now, the best option is to download this .gblorb file from my Google drive and use any Glulx interpreter to run it. Personally, I use Gargoyle.
Edit: the IFDB page now has a working “play online” link, so interpreters are no longer necessary.