Add mute button between menu and full screen button. Reason: Its web game after all. And wonderfully casual one. I can perhaps be talking with someone on skype while playing the game , for example. Or many other things. This is why I love the game - it doesn't force me to focus on it all the time. This is why music, however good - sometime can be not fitting. And only way to mute right now it manually muting from the options menu. I think simple - accessible on-of switch should be available
