Consider other books about castaways, such as The Narrative of Arthur Gordon Pym of Nantucket by Edgar Allen Poe, Robinson Crusoe by Daniel Dafoe, or The Island of the Blue Dolphins by Scott O’Dell.
Consider other allegorical works of literature, such as The Little Prince, by Antoine de Saint-Exupery. Also consider other works of magical realism, such as novels by Gabriel Garcia Marquez or Hari Kunzru.
Other works that play with the "truth" of a fictional narrative include Atonement by Ian McEwan and Trust Exercise by Susan Choi.
The short story "How To Tell a True War Story" from Tim O'Brien's The Things They Carried would also pair well with this novel's questions about truth in...