An example of how to serve two different endings in your HTML5 Phaser game depending upon player performance.

EmotionalFulcrum.js

CanyonRunner.EmotionalFulcrum = function(game) {

    this.angelicVoices = null;
};

CanyonRunner.EmotionalFulcrum.prototype = {

    create: function() {
        this.sound = this.game.add.audioSprite('sound');
        this.sound.play('sonar');

        //Set Background
        this.background = this.game.add.tileSprite(0, 0, 1200, 800, 'sad-desert');
        this.background.fixedToCamera = true;
        /////////////////////////////
        //CREATE SOUND TOGGLE BUTTON
        /////////////////////////////
        this.soundButton = this.game.add.button(this.game.world.centerX + 240, this.game.world.centerY - 290, 'sprites', this.toggleMute, this, 'sound-icon', 'sound-icon', 'sound-icon');
        this.soundButton.fixedToCamera = true;
        if (!this.game.sound.mute) {
            this.soundButton.tint = 16777215;
        } else {
            this.soundButton.tint = 16711680;
        }
        //////////////////////
        //READ LOCAL STORAGE
        //////////////////////
        this.playerStats;
        if (localStorage.getItem('Canyon_Runner_9282733_playerStats') != null) {
            this.playerStats = JSON.parse(localStorage.getItem('Canyon_Runner_9282733_playerStats'));
        } else {
            this.playerStats = {
                topScore: 0,
                topTime: 0,
                returnPlayerToState: 'NavigationHome'
            };
        }
        //////////////////
        //CREATE PLAYER
        //////////////////
        this.player = this.game.add.sprite(64, 64, 'sprites', 'rocket-sprite');
        this.player.y = 120;
        this.game.physics.enable(this.player, Phaser.Physics.ARCADE);
        ///////////////////////////////////
        //Create Particle Jet Engine Burn
        ///////////////////////////////////
        this.emitter = this.game.add.emitter(this.game.world.centerX, this.game.world.centerY, 400);
        this.emitter.makeParticles('sprites', ['fire1', 'fire2', 'fire3', 'smoke-puff']);
        this.emitter.gravity = 20;
        this.emitter.setAlpha(1, 0, 3000);
        this.emitter.setScale(0.4, 0, 0.4, 0, 5000);
        this.emitter.start(false, 3000, 5);
        this.emitter.emitX = this.player.x - 25;
        this.emitter.emitY = this.player.y + 30;
        this.burnEngines = true;

        this.descendToLearnTheTruth();
    },

    update: function() {

        this.emitter.emitX = this.player.x - 25;
        this.emitter.emitY = this.player.y + 30;

        if (this.landing) {
            this.landingEmitter.emitX = this.player.x + 27;
            this.landingEmitter.emitY = this.player.y + 30;
        }

        //At rest, player should not move
        this.player.body.velocity.x = 0;
        this.player.body.velocity.y = 0;

        this.playerSpeed = 250;
        this.backgroundTileSpeed = 4;

        //Scroll background for flying appearance
        if (this.slowRocket) {
            this.background.tilePosition.x -= 4;
            this.sound.play('sonar-found');
        } else if (this.stopRocket) {
            this.background.tilePosition.x = 0;
            if (Math.floor(this.player.angle == -90)) {
                this.stopRocket = false;
                this.player.angle = -90;
                this.rocketLanding();
            }
            this.player.angle -= 2;
        } else if (!this.landing) {
            this.background.tilePosition.x -= 10;
        }
    },
    toggleMute: function() {
        if (!this.mute) {
            this.game.sound.mute = true;
            this.mute = true;
            this.soundButton.tint = 16711680;
        } else {
            this.game.sound.mute = false;
            this.mute = false;
            this.soundButton.tint = 16777215;

        }
    },
    descendToLearnTheTruth: function() {
        this.sound.play('sonar-found');
        this.homeSignatureLockedTextStyle = {
            font: "25px Arial",
            fill: "#09e000",
            stroke: "#000",
            strokeThickness: 4,
            align: "center"
        };
        this.homeSignatureLockedTextString = "Home Signature Detected! Calculating Landing Trajectory!"
        this.homeSignatureLockedText = this.game.add.text(this.player.x + 20, this.player.y, this.homeSignatureLockedTextString, this.homeSignatureLockedTextStyle);
        this.homeSignatureLockedTextExpiration = this.game.time.create(this.game);
        this.homeSignatureLockedTextExpiration.add(4000, function() {
            this.homeSignatureLockedText.destroy();
        }, this);
        this.homeSignatureLockedTextExpiration.start();
        this.game.add.tween(this.player).to({
            x: this.game.world.centerX,
            y: this.game.world.centerY + 100
        }, 5000, Phaser.Easing.Linear.None, true);
        this.descendTimer = this.game.time.create(this.game);
        this.descendTimer.add(4900, function() {
            this.slowRocket = true;
            this.emitter.kill();
        }, this);
        this.descendTimer.start();
        this.beginLandingTimer = this.game.time.create(this.game);
        this.beginLandingTimer.add(5300, function() {
            this.slowRocket = false;
            this.stopRocket = true;
        }, this);
        this.beginLandingTimer.start();
    },
    rocketLanding: function() {
        this.sound.stop('sonar');
        this.sound.play('angel');
        this.landing = true;
        this.landingEmitter = this.game.add.emitter(this.player.x, this.player.y, 400);
        this.landingEmitter.makeParticles('sprites', ['smoke-puff']);
        this.landingEmitter.gravity = 20;
        this.landingEmitter.setAlpha(1, 0, 3000);
        this.landingEmitter.setScale(0.4, 0, 0.4, 0, 5000);
        this.landingEmitter.start(false, 3000, 5);
        this.landingEmitter.emitX = this.player.x - 25;
        this.landingEmitter.emitY = this.player.y + 30;
        //Landing Tween
        this.game.add.tween(this.player).to({
            y: this.player.y + 350
        }, 10500, Phaser.Easing.Linear.None, true);
        //Jump to Final Scene Timer
        this.showFinalSceneTimer = this.game.time.create(this.game);
        this.showFinalSceneTimer.add(10500, function() {
            this.sound.stop('sonar');
            this.sound.stop('angel');
            if (this.playerStats.topTime > 355) {
                this.state.start('EveryThingYouBelievedAboutYourFamilyWasHellishlyWrong');
            } else if (this.playerStats.topTime <= 375) {
                this.state.start('HomeSweetHome');
            } else {
                this.state.start('EveryThingYouBelievedAboutYourFamilyWasHellishlyWrong');
            }
        }, this);
        this.showFinalSceneTimer.start();
    }

};