@vectrds an easy way to try this, is to place a body-end.html file in a Documents\Shapespark\SCENE-NAME\ directory on your disk with the following content:
<script src="https://cdn.jsdelivr.net/gh/Shinichi-Marumoto/shapespark-controller/shapespark-controller.js" type="text/javascript"></script>
This will include the joystick script as part of your scene.