nanobot.js

/** nanobot */
var Nanobot = function(game, x, y) {
    // extends
    Phaser.Sprite.call(this, game, x * pxr, y * pxr, 'nanobot', 'nanobot-180');

    // members
    this.hoverBase = 6;

    this.hoverEffect = game.add.tween(this);

    // defaults
    this.scale.set(2);
    this.anchor.set(0.5);
}

Nanobot.prototype = Object.create(Phaser.Sprite.prototype);
Nanobot.prototype.constructor = Nanobot;

Phaser.Utils.mixin({
    update: function(){
        var dt = Phaser.Time.elapsed;
        this.y += 1;
        Phaser.Sprite.prototype.update.apply(this, arguments);
    }
}, Nanobot.prototype);