A text-based idle game from before those were everywhere, and for my money it’s still the best one. Unusually for an idle game, it has an actual story with an actual ending. It presents a very coherent experience - the sparse visuals and writing, the mechanics that make sense on the surface but are really dark if you think through their implications, and the environmental storytelling of the post-apocalyptic setting that you explore in roguelike sections that spice up the gameplay all come together to create a compelling atmosphere.