I'm sorry to hear that! Have you tried a different browser? You are the first to have this problem, so it might be something on your end.
Happens to me too. I'm using the Itch PC program.
I think you should compile to a native PC version, which won't take too long since you're using Unity :P
Nevermind, I just realized that Itch on PC downloads the game itself, which won't work since WebGL doesn't like running games locally.