This is YA novel set in nearish future Australia after an apocalyptic viral infection has killed just about everyone. The MCs are a set of twins about 15 years old.
I loved the surreal dreamscape of the Changeland, where teenagers transform and where anything could happen.
Because the 2 main characters are a set of psychically linked twins, and they are on alternate quests to save one another, there‘s a bit of repetition. Good first novel!