Thanks for your report.

I don't own any Apple device, so I'm not able to reproduce the issue, fixing it might be difficult, unfortunately.

I believe "Homescreen App" is the app you use to launch other apps (including your browser), but not the browser itself. If I'm right, your actual browser is probably Safari, which is the default browser on Apple products.

Safari is known to cause issues with Canosa that don't exist on other browsers (see this one for example : boardgamearena.com/bug?id=67854), and to be quite problematic with some recent web features in general. Any chance you can install Chrome of Firefox and give it a try ?

I was able to try the game on a friend's iPhone 12, with Safari.

The loading screen showed, then went black (not entirely, it looked like a semi-transparent black layer was applied upon it). The progress bar never filled and the game never loaded.

This happened twice, and at the third attempt, the game loaded and could be played normally. Beyond that, the game could also be quit and reloaded normally, the issue never appeared again.

This is similar (but yet clearly different) from what you both experienced. I believe one file (at least) is giving iOS trouble. Once it's loaded once and put in cache, everything is fine.

My guess is on the images, because I didn't see any kind of program error and because I'm using webp image format, which is cool because it's very lightweight, but was created by Google. It wouldn't be a big surprise if Apple didn't put much effort into supporting it...

I'll see if I can find more info about this.