This is slick but leaves a lot to the GM. I feel like given the constraints of the jam you could easily expand to a 3x5 index card (also easy to find printable media for) and have considerably more room which you could use to guide the experience more.

That said, this is pretty awesome!

Holy hyperminimalist presentation! You could totally print a sheet of these up on those Avery card things and just hand it to people.

Business-card size games are really a good idea to be able to offer a game to anyone, anywhere. It needs also a pretty good GM who knows how to get people to talk