That’s strange. I tested it on several browsers and even on my phone and it works fine on my side. Are you having issues with other 3D games as well, or just this one?
Had to wait very long time to play it, but after 5-10 minutes, it started. I updated my ratings. This generally happens because of compression format. You can find the setting under the Player Settings -> Other. Try to change it something else, it is probably Brotli selected right now.