I would have loved to play a longer version of this game with more puzzles, and more of a symbolic journey that foreshadows the twist at the end. As it stands, I think you have a wonderful little short story of a game here, and I think there's a lot of potential to explore the character's path to acceptance.
You are dancing close to a meta-analysis of the prompt as it concerns games: do players really have control over their character's stories when their endings are already set in code? What significance does that give each player's journey?
So far as actual implementation things in the game go, I'd love to hear more ambient sound (unless the starkness of the soundscape was what you intended). I did really like the foot prints -- I could have gone for some dialogue progression SFX as well.
Over all, you've got some sturdy bones for a strong story on the nature of games. Great work! Delve deeper!