Check your security settings, and make sure you're not running anything like noscript. You can always turn those things back on after playing, but those settings would probably block needed features for the game to run. Same with trying to do it in a private window.
if still having issues you might have to wait awhile, the creator is doing a rewrite of season 1. (not positive as hasnt looked deep into it but there might be some rewriting to season 2 (just my guess based on rewrite of season 1))
HEY IF YOU USE THE DESKTOP APP THINGY U CAN PLAY OFFLINE WOUT THE BROWSER, i dont know any other way to explain, but it sounds like ur trying to play it like i did