Hmm. I’m not sure if this would count, I’m afraid. I mean, there’s creativity there, but it seems like it’d be difficult to actually make spells from it that fit with this work’s magic. It seems incompatible with having any kind of intentional magical results.

Game design could count, though. What kind it’d be would depend on what you mean by ‘game design’ though: if you mean like video game design, then it’d be Perpetual and only the one original copy that you make is magical. If it’s like tabletop game design, then it’d probably be Performative (with the Game Master being the main artist, though it could also be collaborative magic with the players)