1. maybe after I finish making the prologue chapter I'll redo the cosmetic system. The current system for customization is hard-coded to use a preset sprite for each part
2. most of the outfits will be a buyable item, as for the RPG systems like leveling, skill tree, and stats are a whole lot of new things I need to implement with the current code and it'll change the genre of the game a bit so maybe after I redo the cosmetic/customization system I'll do it or not at all
3. didn't think of this before a minigame to earn money or a reward would be nice
4. no idea how to make the game moddable at the moment, but I'm interested.