We've ended up uploading all of our 'physical games' rpgs as Books because that seems to be the only product type that displays the whole cover in the thumbnail. Not sure if that has relevance here, but I thought it worth a note.
Viewing post in Physical games classification project
I mean, the games we have up on here are also books; RPG books. They're both "physical games" and "books", if you define them by their form. If you use the stricter definition offered for the book category on itch, e.g., "tells a story" it's a bit muddier.
At this point I've also got, like, dozens and dozens of entries, so it'd be some work to go through and recategorize them all...