i'm sorry did you say street magic is a surprisingly beefy one-session city-building game about the spirits of places.
It's got gorgeous and charming art and a simultaneously bold and soft layout that makes it super inviting to read and engage with, and it specifically builds game breaks into its flow in a way that I really dig.
Also, by the end of a session, you'll have a fully realized and vibrant city. This is fun in its own right, but probably doubly valueable to writers and designers and folks who benefit from having fully realized imaginary places on standby.
The game does tend to have one speaker defining facts about the setting at a time, so if your group likes very collaborative, discussion-based world-building, you may want to be a little looser with the game's structure. That said, there's also an extensive GMing advice section, so you'll have a lot of support for any other changes you want to make.
Overall, if you like games like Microscope and Quiet Year, or if you want a worldbuilding tool that will supply you with an extremely organic and lived-in feeling place (you could even use it for a dungeon ecology), get this game.