If you loved Castaway on the Moon, try Hello Ghost
A bridge between a film you've already seen and one most people haven't. Hello Ghost has roughly 6.0× fewer votes than Castaway on the Moon — 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.
What they share
Theysit in Comedy / Drama / Romance territory. If that's the register that drew you to Castaway on the Moon, the second film will land in a comparable space — through a different lens.
What Hello Ghost is
Apparently ghosts are like clingy relatives. A man's failed suicide attempt allows him to see ghosts. Now he has to help them to get some peace.

