I never played the storyline, as my only experience with the game was on survival mode. The atmosphere of this game is incredible. I think it was probably one of the most immersive gaming experience I ever had. I surprised myself playing for over 5 hours in one session without noticing.
This game is beautiful, with a wonderful art direction and beautiful landscapes. It leads to very contemplative moments. Yet, this game is very brutal and unforgiving (sometimes unfair too). Nourriture is always scarce, there are wolves waiting at every corner, and we often have to make difficult choice with no optimal solution. It means that playing this game is often a struggle.
This alternance between contemplation and stressful moments really enhance the feeling of having to survive in this beautiful yet cruel frozen wilderness.
The ankle mechanic though... I disabled it in custom mode, because it was way too stressful for me (I get the point, but it did not work for me).