Thanks for the help! by the way, your game is very fun!
In my case, I did get a loading bar for the HTML version when I uploaded using your method with the zip file as the root. So I think that's the one that works. However, after the loading bar I still get a black screen.. On Microsoft Edge I get the error (WebGL2 not available), on Chrome it just crashes, and I even tried it on my iphone and it seems to be just infinitely loading. Gave up on HTML now, but did upload the other Linux and Mac versions, which was very easy to do.