Please disable any adblocker or popup blocker you may be using. It seems to prevent the game from running. If stuck at a download screen, disable your blockers then refresh. Thanks.
If anyone has the "white screen" bug after latest Firefox update (June-7), the solution is: Tools -> Add-ons -> Plugins -> Unity Player: Set to "Always Activate", then refresh the page. Firefox decided to deactivate your Unity plugin, how nice.
 "Goldcraft")