Well, for your first attempt at not-pixel art, I'd say it was a huge success! My partner and I were smiling at how cute it was, and the message was really touching, with neither of us being unfamiliar with mental-health.
The main-menu loop was really cute, and reminded me of the trick that Fez pulled! Perhaps some small visual cues and a tonal shift in music would convey that something wasn't quite right.
Amazing that you were able to get all of that done in such a short amount of time. Great job! (I wonder if you might explore more/adjacent for https://itch.io/jam/mental-health-game-dev-champions-2024?)