I installed this on the itch.io app and got the following error when I launched it; I believe it is caused by a setting devs can set when they build the files? (I don't know, I'm not a dev but I read other comments on other games that suggested something like this...):
"Unable to parse Build/Builds.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."
Edit: There is a setting in Unity... that was it... not sure where but something needs to be included with the build I think?