I think the concept is really cool and the way your character controls is hands down the best first person exploration experience ever. They way you have to take hills and slopes into account while moving really helps immerse you in the experience. I'm wondering how this would feel with the oculus rift but I doubt that'll happen since these guys built the engine themselves so unless they really want to code rift support from scratch there's no way for them to do it.
I'm pretty far into my first playthrough at the moment and my biggest complaint (aside from being able to triangulate your position using 2 landmarks right next to each other) is actually about the late game. I'm not sure if I'm alone in this but the beast seems to appear way too often at this point. I'll be walking for less than 5-10 minutes in between sightings and even when hiding successfully have had the creature persist in searching for me for 10-15 minutes. Other times it gets stuck in an infinite loop where it runs around in circles forever and I have to try and sneak far enough away for it to despawn only to show up again 2 minutes later.
Other than that I'm really enjoying the unique experience and will probably try beating it as fast as I can for a second playthrough.