Undying, a unique indie survival game, is available for free on the Epic Games Store for the next 24 hours. Emotional storytelling - Unlike other zombie survival games , Undying focuses on the relationship between mother and son, making every moment count. Inspired by The Last of Us - While Undying isn't an action-heavy game, its emotional weight has drawn comparisons to The Last of Us , with a strong emphasis on character-driven storytelling.