Thankyou for getting back to me! I know it just looks like I was doing something dumb and perhaps I was but I absolutely had it set to restricted. The game is not intended to be downloaded, just played within the browser. 
HOWEVER...
After trying it just now it seems password is working as intended. Previously I had many people trying and failing to see anything to play, some message about not having any content available. This doesn't appear to be happening anymore....
My next update will be in 5 days, I will again experiment with the restricted setting then. If there are further complications I will reply with the details of the issue.