You have to click on the 'ok' button down the screen. it's a bit clunky but if you insist you should be able to access the main menu title. After that the game should work fine. I recomand you to play in full screen.
I read that on the information for the game, but the fullscreen button wasn't available for whatever reason. It's normally at the bottom left under the frame in most HTML games on this site but I didn't see it there this time.
