Ambiguity is fine for adults, but it may or may not work for kids.
Amazon says this is aimed at ages 4+, but this would go right over a preschooler's head, and unfortunately that might mean they would get a message that it's not okay to be scared. Plus a list of scary things that maybe they'll be able to "shoo" away and maybe they won't.
Message
Don't be afraid of the world. Or, everybody is actually pretending that they're not afraid of the world.