Halfway through in one sitting. Stuck on a puzzle, and have died a lot, but somehow that's ok. The game is very forgiving about its checkpoints, as it should be. This isn't about challenge and frustation, but feels more like it's about adapting and understanding the rules of the world. Like that angle.
I see some comments about looking for a story, but to me it doesn't feel like the game is trying to have a coherent story yet. Maybe it'll come later, but for now I think not knowing why you're in this strange, atmospheric and dangerous world adds an extra layer to the sensation of playing it.