I'm new to itch.io development, and first I have to say how impressed I am at the developer experience. From butler, to the page design tools, to the friendliness of the community, it's been fantastic.

Signed by ’89, an HTML5 game, had a no-audio problem on some Safari and Brave browsers, which I believe I've now resolved locally. I've been testing using a local HTTP server and my own "pretend this is running on itch.io" iframe wrapper, but I'd love to test against the real itch.io environment. I'd like to push an "update candidate" which I can test thoroughly without affecting the live build.

So far I haven't been able to work out how to do this, using butler or any other method, short of creating a whole new "unreleased" project just for testing. Is what I've described possible? Am I missing something obvious? Thanks!