I'm sorry to hear about the crash. Another player had a crash after the intro, that seemed to resolve itself later. The only crash I know about happens if a gamepad is connected (or reconnected) while the game is running. So maybe check USB devices? I don't know, I might just be running an especially bad version of unity.
If this rating period ever ends I'll try to get the WebGL export working too. If it's a Unity issue, then maybe a different platform export may work better.