uploading the VT_ADV Downloadable zip to itchio as-is and setting it to a HTML project with "this file will be played in browser" will work straight out of the box in firefox, chrome, and internet explorer.
With no information about your setup I'm not sure what to advise you try. If nothing happens I would guess the code.js file is missing/cannot be reached. If you bring up the console do you get any error messages?