Sean Gilman’s review published on Letterboxd:
There are many films wherein a character creates a false reality in order to help cope with some trauma they've suffered, a devastating break-up (Annie Hall) or a haunting death (Romancing in Thin Air). This is the only film I know wherein a character moves from a false reality to a real one in order to cope with a trauma he's suffered in the fictional world.
And of course, that catharsis is facilitated by a character (a young boy, of course) moving from the "real" world to the fictional one.
"I don't like you. You've brought me nothing but pain."