I've try to run the web version of this game on my Mac, but when I open it, I got a "Failed to load: data/Map004.json".
Viewing post in Crossdressing in Camelot comments
Generally you need to set up permissions in your web browser to be able to save and load data, which causes them to not run if it's not set up. This link should run you through how to set that up for your browser. https://www.reddit.com/r/RPGMaker/comments/dqvdqo/fix_error_failed_to_load_dataa...