The loop is compelling, and from what I gathered you're able to define your character in an engaging way that subverted my expectations at first. I just got a bit lost later on in the shuffle between who the protagonist is and who I am. While the epistolary style works really well (and makes for a great interface to go with the board concept), it's not entirely clear at first that the player's responses are their thoughts, so it may need some more framing/setup.
Would also be an interesting sci-fi concept to combine the letter and diorama into some kind of futuristic document that reacts to the user's subjectivity/thoughts, which could lend some tragedy in how the account you're being given is highly subjective, highly excessive and user-optimized to the point of being counter-intuitive.