Not the dev(of course), but I wonder if your issue might have to do with needing to run the engine on a local server for offline testing/playing. There's a bit about that in the Read Me included w/ the downloads, and the FAQ up top. If you've already done that, then never mind, plz ignore me.
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.