The idea of a mascot-horror parody where the kid mistakes an ordinary man in a brown costume for something terrifying is hilarious. I love that twist! Was the game inspired by the classic mascot-horror genre, or did you come up with the concept specifically for Shroom Jam?
Well, yes to both of them
I've noticed that trope of "child entertainment, but it actually scary" was way too abundant recently. I think it's got to the point, that actual mascots can be scary to some children (total speculation on my side, to be honest). "Tucker & Dale vs. Evil" is one of my favorite movies, and this game is basically this, but in different setting.
ShroomJam theme was just perfect for this idea.