Here’s what I think happened: there was a meeting about movie ideas, and someone said “We should do a classic ‘Fish out of water’ story,” and someone else said “Yeah! With Vespas!”
It’s not exactly a deep story with a complex message, but it’s fun, and the animation is light and breezy. No dark shadows or ominous music here. Even the constant threat of the main character getting hunted and killed is played for fun.