ADD TO Game.js

this.overmessage;
this.secondsElapsed;
this.timer;

-- create
this.secondsElapsed = 0;
this.timer = this.time.create(false);
this.timer.loop(1000, this.updateSeconds, this);


ADD TO Game.js
updateSeconds: function() {
	this.secondsElapsed++;
},


-- buildWorld
this.timer.start();


-- checkBunniesLeft[if bunnies is 0]
this.overmessage = this.add.bitmapText(this.world.centerX-180, this.world.centerY-40, 'eightbitwonder', 'GAME OVER\n\n' + this.secondsElapsed, 42);
this.overmessage.align = "center";
this.overmessage.inputEnabled = true;
this.overmessage.events.onInputDown.addOnce(this.quitGame, this);

-- ADD

quitGame: function(pointer) {
    this.state.start('StartMenu');
},