See above. Reviews can only be seen by a game's creator. They're more of a way to leave feedback privately as opposed to in a comment.
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This is an extremely fundamental and, for many, vital feature to be excluding from your storefront. I have no doubt that it is costing you sales. Is there an official reason for this? I saw another moderator comment about itch.io's plans to revamp its review system, but that was from three years ago.
I hope you guys change this sometime, as I think that itch.io fills a unique niche and would really like to see it gain more traction.