If you loved Professor Layton and the Eternal Diva, try Crayon Shin-chan: Invasion!! Alien Shiriri
A bridge between a film you've already seen and one most people haven't. Crayon Shin-chan: Invasion!! Alien Shiriri has roughly 3.4× fewer votes than Professor Layton and the Eternal Diva — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Professor Layton and the Eternal Diva

Crayon Shin-chan: Invasion!! Alien Shiriri
What they share
Both films are directed by Masakazu Hashimoto, and they both carry the playful mood tag, and they sit in Animation / Family territory. If that's the register that drew you to Professor Layton and the Eternal Diva, the second film will land in a comparable space — through a different lens.
What Crayon Shin-chan: Invasion!! Alien Shiriri is
Another day, another alien baffled by Japanese parenting norms. Shin-chan sets out across Japan when a curious space visitor reduces his parents to toddlerhood. The film quietly argues that home truly is where the weirdness never stops.