yes, but you can review the game to the public by suggesting the current game in the Itch.io's community
Viewing post in I think we should have a review system.
Sure, but would that appear on the game page? No. Think like a customer. When you buy something from amazon what's the first thing you check: the reviews at the bottom of the page obviously. Would you buy an amazon product with no comments?
If I happen on a game page, as a customer, i'm not gonna look in the forums to see if that game is any good. I'm going to look for comments on that very page. And if someone has written a review through the prompt, but I'm not following them, I won't even know there's a review! Bottom line is: while we have a review system, I don't think it does a lot to make people buy games, and therefore it doesn't really help creators. It could be improved on