Thank you for the play-through, was very entertaining! Sorry to ruin the mystery but there isn't any secrets as I didn't have a lot of time to implement much else. Definitely something I would love to do if I had more time or decided to add more to the game!
I have noticed that some of the graffiti says many of the same things as the monster's license plate. Maybe bringing it to the wall with all of the graffiti could do something in the future. Once the jam is over.