It looks like chrome is a little broken at the moment...
I haven't tried this, but you might need to install a plugin of some kind.
Just as I thought!
Chrome is being very difficult to the point that not even plugins can save this.
Maybe Firefox might work, but I don't usually use it, and I don't endorse the use of Internet explorer.
So, I tried firefox, and it failed to boot the game, and there doesn't seem to be any settings that allows me to change this.
The only browser that this game currently works with is Internet Explorer. If you're desperate for this, then maybe you should try it there.