The atmosphere is really great. It looks amazing and feels amazing. However: The content is really limited. Procedurally generated or fixed map you get the same landmarks over and over. When you manage to figure out the food and water problems you've seen pretty much everything from the game. I would say 10 hours play time at most unless you really really realllly like the atmosphere. There is no end game really, there is no progress. The game has really great potential, but it needs tons more work.