Glad to see someone else likes their work :) I really enjoy Brendan's mix of humor and more serious themes. I can't wait to play more bell park if it comes out :)
Very cute :3 I like the last one the most :)
The systems that come to mind are blades in the dark (as you mentioned), and numerna (with the town expansion, I think its "building tomorrow").
Regardless of system you choose I think you will need a lot of homebrew. So I would suggest picking a lighter system if you can so that homebrew is easy/trivial. But I'm not sure what feel of game you are going for.
Some of my favorites are Birdland, Counterfeit Monkey and Midnight, Swordfight. I also really loved the Exceptional Story "Codename: Sugarplum" in Fallen London, but that's a lot less accessible.