Very innovative climbing system with plenty to it, the likes of which I've never seen anything quite like. Some outstanding environments. Jusant is seriously pretty, and the soundtrack only adds to its beauty.
The game is short, but I think it's a good length; if the game was much longer I'd probably have started to get bored of it unless it was a bit more interesting.
Wasn't interested in exploring for the collectibles, lore etc. I just wanted to climb.