Same here (Linux). The workaround by changing the User-Agent over the devtools works partly, as in not every part of the app. Also it's annoying as you always have to keep open the devtools and do it again on each restart. Should be fixed asap please.
Installing a game (bottom of a game's page) seems also weird. It takes nearly a minute or longer to "calculate" which version is should install or its size etc.
I'm having the same issue (Win 11). It's frustrating to see that this has not been fixed yet, even though people have been reporting this for two months. What's going on at itch.io?
Bump. Still absolutely not understandable why nothing has been done yet. Check the Cloudflare settings or just completely ditch it and use another service for it, ffs.