Check out http://quirktools.com/screenfly
You can test your game on various device sizes (and custom resolutions).
Simply type your C2 local ip into the URL to test your game locally eg: 192.168.1.10:50000
Develop games in your browser. Powerful, performant & highly capable.
Just wanted to let anyone who's looking for an alternative know that Chrome's developer tools has this feature (https://developers.google.com/web/tools ... -viewports) and so does Safari (https://developer.apple.com/safari/tools/). Other browsers may have it too, I use only these.