I think, as we cruise through different genres, we should leave notes about lines of questioning we'd like to go down. If we play a rhythm game and feel like everything was covered, there wouldn't be much reason to play another one, right? (For instance, I think we could say a lot more about powerups in platformers, even after Magical Quest and Shatterhand.) But if we play a rhythm game and come away with unanswered questions, we could pile those up for a later rhythm game.
Or, if there are things you'd like to discuss in the future that aren't related to a game we're playing right now, feel free to bring that up, too.