I wrote a script to list ratings/reviews for multiple games on Steam, and I would like to build something similar for Itch.

Steam currently has a free (non-login-required) API you can poke to get ratings information for any of the ratings/reviews on your games. It doesn't require an OAuth token or anything, it's just a public-facing API. Here's a sample URL that shows reviews for my Steam game: https://store.steampowered.com/appreviews/1342600?json=1&filter=recent&num_per_p...

Is there any such thing on Itch, or any plans to make one? I checked all the API docs but didn't see anything.

Maybe at some point but we don’t have this right now. Reviews currently aren’t publicly browsable for games, they are only visible by followers of the accounts that create the reviews, and by the game developers. We’d like to make some updates to how the reviews system works before opening things up more.