“The Last House” (Netflix) By MAYA PHILLIPS Being trapped is a reliable premise in horror films and psychological thrillers, with good reason. It’s a primal fear, the type of situation that strikes right into our animal brain. And it has become an apt metaphor, representing the fears and traumas of a younger generation who has surged back into theaters this year to see its own anxieties reflected. The terrors of monotony Familiarity is usually synonymous with safety. What’s more comforting…