Definitely understandable to have cut it then! We ended up cutting the WebGL version entirely for our game because of issues we had with it too which, hindsight 20/20, wish we had put a little more time into making it work haha. Better to have one without fullscreen than no WebGL version at all. The key controls is probably something to do with my browser choice more than on your end, my system is starting to get a bit aged too so I'm definitely inclined to think the issues are more my fault than anyone else's.