I updated my sky rendering experiment to now write out diagnostic information in a way that's mobile-friendly when the demo can't initialize or hits a fatal error.
https://zone.dog/games/firmament9/Nothing else is different from before, but if you've got a phone or tablet handy I'd appreciate if you could try it out for me and tell me if you see text (tell me what it says!) or a black screen that persists for more than a minute or two. (if you see clouds, that means everything is working)