Tried it out on a few different browsers.
On Google Chrome, couldn't get it past this page:
On Firefox, I got this:
Viewed the certificate and told it to run anyway. Managed to get it downloaded and it didn't take too long at all. Played the mini game during the wait. How nice of them.
Got stuck on the never-ending loading screen. Waited nearly an hour and still hasn't changed.
No luck on Safari either. It says the game is downloading but there is just empty space where the progress bar should be.
So, I'm 0 for 3. If any other Mac users have any luck, please post. If not, I won't waste any more time messing around with it when the normal application is working just fine.