Because of the security settings I use, I block code from any domain that isn't on a whitelist. If a game needs to run code from another domain, it most likely won't be able to run it unless I manually add it to the whitelist.
In those cases, my first thought is that it might be a security risk or the game is simply trying to use the Itch page to drive an audience to their site. Unless I have a good reason to test the game or trust its developer, I won't try to play it.
I'm not saying that's the case for you, I'm just explaining why I consider it a limitation.