Actually I think there is something wrong with itch's implementation. If you view source (I did it on your page) you can see only the old GA analytics loaded (analytics.js) but the new GA4 should be gtag.js.
So I do think this is a problem that itchio need to solve.
The reason I think it's working for me is that I found a new profile had been automatically created for me using the old script. So mine might stop working at any time.