For some reason, when I try to play ANY game that needs a controller, it just won't work!
P.S: Yes, the controller works, I have played lots of steam games with it.
That's odd. Are you launching the games from within the itch.io app, or directly? Are these native or browser games? If the latter, which browser? My own browser games for instance only have controller support in Firefox, because in Chromium it doesn't work the same way.
Come to think of it, what kind of controller do you have? Mine is a generic USB model, so that's what I support.