Just as a heads up, the initial popup does seem to work here on firefox, might be a chromium issue (which means it effects all browsers besides firefox)
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Good to know. I was testing on Chrome Mobile and Chrome desktop. It also may have been an issue with how the fullscreen mode works and sort of killing the pop-up in some browsers. I'm glad it worked as expected for you though! I will keep an eye on this when I test in other browsers with future updates.
I note that itch does some bad things with web games on firefox (for many, you click "Run Game" and it opens a new window, rather than 'reusing' the old one, so I think it's just itch's bad behavior! I'd suggest maybe prodding the itch support forum, since I've had many issues with that system breaking!