Hello there! I have some experience with using Renpy to create visual novels, so I'd be more than happy to join you in making something using that engine :D Unfortunately, I won't be able to dedicate heaps of time to this in the next few weeks (I'm part of a musical and it's consuming my life lol) but I can still get started on brainstorming and planning right away, and can properly work on it from about mid-July. Let me know if you'd be interested in working together!
(as a side note, I love Cookie and if you like board games I would highly recommend Deep Regrets - very much has Cookie's aesthetic!)