Are you using an older computer? I did some looking around google, maybe youre setup has a hard running WebGL builds from unity. I dont know how to solve that though. :/
I am using a desktop, Ryzen 7, 16gb ram etc etc. But I think it's clearly my fault if others can play? Seems like I can play 70% of the games and the other 30% will just not load. Bizarre. I'll get back to you friend, sorry for the trouble. :(