What browser are you using? Typically WebGL games work better on Chrome, Microsoft Edge, and other conventional browsers. Brave, Tor, etc. are more liable to cause errors though. There's also a little bit of a load time with WebGL games so it might be that too.
I tried it again just and it unfortunately still won’t load for me, I’m using Chrome, cleared my cache, restarted my browser and still no luck. I’ll try again in the morning.