If you loved Mon Mon the Water Spider, try The Castle of Cagliostro
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Hayao Miyazaki, and they both carry the playful mood tag, and they sit in Animation territory. If that's the register that drew you to Mon Mon the Water Spider, the second film will land in a comparable space — through a different lens.
playful
What The Castle of Cagliostro is
Lupin the Third gets stuck with fake loot. He and Jigen target the Castle of Cagliostro. It's a heist with a princess.

