Navigator is a three page, two-player, GMless rpg with a feeling similar to Stalker, Roadside Picnic, Metro, and other post-apocalyptic-plus-the-unexplained sci-fi stories.
You play with d6s and a deck of cards, and you take on the roles of two people---one with experience inside the wild Zone, and one without.
This baked-in dynamic is neat, but a lot of the gameplay is storytelling and map-drawing, so you'll be riffing off of each other's ideas as you describe the setting probably more often than you're in-character exploring the cool dynamic.
The game is open-ended, and it doesn't force any one particular mood, but it really does seem to want players who are first and foremost interested in improvising a story. If that's you, this is a really solid game, and I'd recommend picking it up. If that's not you, but you like things like Fallout, you may still want to give this a shot.