i had some trouble with mouse capture on firefox linux with the web version, but i'm not sure there is much you can do about it don't worry.
Always love a good "the purpose of a system is what it does".
I did see the end of the road and manage to kill myself (which I would argue constitute a valid ending xD). I'll try to finda windows machine in my vicinity to play more. Then again I played alone so I'm not surprised I couldn't clear the game yet ^^