Thank you MeiZi for the reply; this does sound like the cause of your problem.
Like several web based engines, Videotome requires running from a server, not directly from your local filesystem; this can be either a local one you spin up yourself, or something like itchio. It will not work without, for browser safety reasons.
Example instructions for running a local server are provided in the README.txt file. zipping up your project folder and uploading to itchio should also suffice, if you are unable to run a local server for any reason.