You can enable comments on your page and people can leave reviews in the comments if they want to.
BUT
Until itch.io has a feature like Steam, that can show you - how much time the person spent on the game, before allowing them to review it, any review here is not really valid. And Steam does some considerable tracking to be able to tell you that information. Itch.io currently doesn't track their user activity after a game is downloaded. So what you're asking would be a fundamental change to the whole of itch.io - they would have to force people to play games through their console and then track what they're playing and for how long. Without that, the reviews are meaningless - because you don't know if the person who reviewed the game actually played it, is a friend of the developer, is an enemy of the developer or is a troll - and not knowing that - means you can't trust the review.