Hmm, what platform was this on? And if web, what browser are you using?
I'm guessing you're using it in incognito mode? It looks like the approach the engine I'm using uses for accessing configuration/data files and such doesn't work well with itch in incognito mode in chrome (or more generally with the "Block third-party cookies" (technical details: the engine uses localstorage for that, which can't be accessed by code running in an iframe with that setting on).
A few workarounds that should let it work if you want to try!:
- Don't use incognito mode/that setting, or disable the setting for itch specifically (go to the game page, click on the lock icon in the address bar, click "Cookies and Site Data" and then uncheck "Block third-party cookies").
- Use Firefox or possibly another browser. I was able to play it from Firefox's private browsing mode.
- If you're comfortable with HTML and the browser inspector windows, I think it should work even with that setting on if you go to the iframe's URL directly.
In any case, sorry about the inconvenience!