I've never used the itch app. Don't forget there are also games that would be downloaded here on a computer and exported to other systems via USB/discs etc.
I know of a couple games here that have been played on a 486 from the early 90s
There is also going to be the issue of lack of compatibility etc as tech moves on and some of the earlier games on here become harder to run.
The itch app uses a chromium browser under the hood. Similar to the steam app.
Games released for old system probably do a better job stating system requirements. New games would run in the browser, if exported as such, that's where the browser "test" comes from. I should specify that you need a modern browser, capable of html5 and all the bells and whistles. Or at least be capable to run such a browser at a practical and not a theoretical level.
