I just attached a downloadable file version to the main itch.io page, so try downloading that and let me know if it works! I experimented around a little bit with it, and it seems to break if I don't extract the file before opening "index," so make sure you extract the folder before playing. When I tried to play the unextracted game, I actually got the same error you seem to be getting haha. If that still doesn't work, send another comment or shoot me a message on tumblr and I'll troubleshoot the code some more!