When packaging the webgl build make sure the html file is at the top level of the zip archive and all associated files and folders are in it as well, then it should work.
If you really can't get it to run online, you might want to switch the game page type from online-play to download-only.
(This is a bit of a let-down as I wanted to at least get through as many directly playable entries I can still manage in the short time remaining for the rating... And I wanted to focus on less-rated entries as well...)