Unfortunately it has almost as poor performance as in the trailer on steam and for a single player shooter game it's below my own standards. The worst thing my browser has crashed after about 10 seconds after i opened the very first door, I don't know if it is because I have 10+ tabs opened, is it a unity webgl bug or the game itself. I didn't tried to play it again after that.
Sounds, music and animation are ok for me.