My idea is "The Broken Watch" and will act as expanded character/world building after you reach an endgame scenario in Project ECCO. The Agent suffers a loss of memory after their 6th encounter with The Agency or The Entity after a jump gone bad. With just the broken Watch to jump through time, they will move backwards through their own personal timeline using the same journal as the Project ECCO playthrough to explore their character and their connection to The Agency and/or The Entity.
I'm working on adjusting the mechanics for the watch device so you move backwards through your personal timeline as well as implementing a "spare change" aspect where you spend the loose change in your pocket to reach a conclusion somehow. So far I like the idea of spending the change in a phone booth where you listen in on a memory long forgotten. I might want to have the ending circle back to the first prompt of the Project ECCO game somehow, like after discovering your character you can decide to either continue working with The Agency by picking up that package, or to get yourself out of the loop and start something fresh. Or something.