There is an official statement on the Discord, it's basically "Nutaku broke something and we can't fix it, but they are aware and working on it.".
Then you aren't using a mobile browser. It only works for mobile browsers or browsers put into mobile mode. It won't help if you swap to another desktop browser. :P
The problem is exclusive to the desktop versions of some of the games, and it's caused due to the script that loads the desktop version failing. The mobile versions use a different, working script, so it loads on mobile.