Congratulations on doing everything by yourself! A simple but well-executed game, that's impressive, especially considering it's your first! The music was great too and really immersive. Your approach on the theme is original and I really liked the narrative behind this.
Some minor suggestions : I would have chosen a more handwritten font to better fit the atmosphere, or maybe record a voice instead of the text because it's hard to read while focus on the game.
That ending though!