I see, so, the game only runs in a limited set of browsers (those that support WebGL 2), but in case the one you're using isn't compatible it should just output "WebGL 2 not supported" or something similar. Could you report what browser you're using, its version, and which operating system?
I'm using the latest version of Brave browser on the latest version of windows 10... come to think of it i've had this problem before. I'll try to use a different browser and see what happens