I didn't know that platform and I confirmed this problem, but maybe I can't fix it (Maybe not work on itch.io launcher).
I think, if you play on local and use windows, the files are installed at "C:/Users/{user name}/AppData/Roaming/itch/apps/holotyping/index.html" by itch.io launcher.
Probably, you can play this on your browser (ex. Chrome).