All I get is an empty, dark blue page after I hit Launch Demo. Perhaps that does look a bit like a night sky, but I don't think that's what you're going for :)
Thanks for the information, i should have mentioned, webgpu is explicitly used here, and this might be the issue!
Bevy's usage of WebGL2 is not that mature, and i use Bindless rendering (from my own contribution)...
Tested in Firefox/Brave/Chrome on Linux.