Hmm... Since starting earlier is allowed, updating an older project should be fine as long as it's a major update and not just, say, bug fixes. So if your chicken thinks a lot and the pre update version is clearly different from the post update one, it's fine.
Viewing post in Can we update an already published game?
Update. I decided to scrap the chicken platformer story for now and instead create a sequel for my story rich RPG I was Cursed to Be a Slime! in which the protagonists help out a new character cursed to be a bird. My plan is that it will be a bit longer and have more lore and characters than the first game.