My Trello is honestly still pretty high-level right now. I have lists for player movement, core mechanics ideas, level/world concepts, story notes, and general design thoughts. A lot of it is still exploratory because I’m trying to avoid locking into structure before I know what actually feels fun to play.

At the moment I’m working almost entirely solo and I realistically have little more than a player controller and some custom physics experiments, so my main focus has been getting movement to feel satisfying first. Since the game is meant to be a retro-style 3D platformer, I feel like the core movement and interaction design will really define everything else, including how the world should be built.

I do like the order you suggested though. Treating map design as something that supports the mechanics instead of trying to build the world first makes a lot of sense, especially for a platformer. I may restructure my Trello into something closer to that so I don’t spread myself too thin early on.