Martha Is Dead is a grim psychological triller about twin sisters, set in Italy at the end of WW2. It’s not about war, however. This game left me with deep emotions no other game could do. Heed the warnings given by authors, though. It may come too disturbing to some people.
YAML for human-written files, JSON for back-to-front and protobuf for back-to-back. XML is an abomination.