I'm developing a tabletop game and I'm looking for a place to report progress, share playtests, and possibly find a partner (I'm missing an artist).

Is itch.io a good place for tabletops too?

There is actually part of the forums specifically dedicated to tabletop games: Tabletop Gaming

Tabletops are definitely welcome, and part of the community. Hope that helps, looking forward to seeing your projects around :)