Oh damn, that's unfortunate. Usually I've found on the first time you ever load the page it can take up to 10 seconds. Do you mind sharing what browser you're using? I've found this generally works on Chrome.
Slow connection speed or you need to clear cookies. But there should have been dowloadable version for a game like this. I always upload a downloadable file in addition to the WebGl version when i submit a game to the jam
