IMPORTANT NOTICE, PLEASE READ THIS BEFORE COMMENTING THAT IT IS BROKEN:
Troubleshooting (Unity WebGL is very prone to causing problems lately, so here are some tips):
-If you see a grey screen, try reloading the page.
-After that, if you see the Unity-Icon, wait a little (max 2-5 min) if the loading bar does not move. The file is about 5MB big, so it should not take too long, although it will very likely take significantly longer than it would normally
-tested with Firefox, it is guaranteed to work there
-if you see the loading screen and think it does not load, just let it run in the background for a while and come back a few minutes later