phaser object variable name

[LorenzoBoccaccia]

it appears if you don't spell the phaser object exactly as game and make it global, slick fails to create some components

ReferenceError: game is not defined
    at SlickUI.Element.Slider.init (slick-ui.min.js:1)
    at SlickUI.Container.Container.add (slick-ui.min.js:1)
    at SlickUI.Element.Panel.add (slick-ui.min.js:1)
    at Object.create (game.js:22)

line is this.displayGroup=game.add.group();