Always fun to blow up some zombies :). noticed a small screen bottom left that was reading out some bug reports like the console. Never seen that before, suspect it's not meant to be in the build? Well done! nice work :)
Thanks! Yes, it's a dev build - the Internet said it would fix the WebGL crash, so that was the build I submitted. I have fixed that issue, so will upload a new version after voting!
Setting compresion format to disabled (project setting > player > settings for webgl > publishing settings) also fixes some kind of crash, could be worth a try.