If you have a red square when the game is not loading in browser after publishing (Unable to parse Build/WebGL.framework.js.br! This can happen if build compression was enabled but web server hosting the content was misconfigured to not serve the file with HTTP Response Header "Content-Encoding: br" present. Check browser Console and Devtools Network tab to debug or smth like this) Try to change Compression Format to Disable (Project Settings >> Publishing Settings) before building the game. I got the same problem before, this helped me.