RequireJS - Gauge is not defined

I love the look of gauge.js and would love to try it out on one of my projects but I'm really struggling to get it to run when including the JS file via. RequireJS 2.3.6. It just says 'Gauge is not defined':

I can see that RequireJS has downloaded and included the JS file but for some reason the Gauge variable just isn't set:

My require.js configuration:

define('global/window', [], function(){
  return window;
});

define('global/document', ['global/window'], function(window){
  return window.document;
});

requirejs.config({
    appDir: "../",
    baseUrl: "/js",
    paths: {
            'Gauge_js': ['https://bernii.github.io/gauge.js/dist/gauge']
    },
    shim: {
    },    
    map: {
    },    
    attributes: {
       crossorigin: "anonymous"
    }, 
    onNodeCreated: function(node, config, name, url){
      if(config.attributes){
        Object.keys(config.attributes).forEach(function(attribute) {
          node.setAttribute(attribute, config.attributes[attribute]);
        });
      }
    }
});

require(['Gauge_js'], function($) {
    return {};
});

I have tried the minified version and the full versions from both CDNJS and bernii.github.io.

Please does anyone have any ideas?

bernii / gauge.js

RequireJS - Gauge is not defined #255