Is it an option to submit a tabletop game of some sort (TTRPG, Card Game, Megagame, whatever)? I expect not, but I like the idea, so I wanted to ask.

Of course it's an option! It would be preferred if you made it on something like Tabletop Simulator so that we could play it on stream for the review stream!

https://store.steampowered.com/app/286160/Tabletop_Simulator/

Best of luck!