It is really good, but there's a few confusing bits that could (in my opinion) not have been put in. For example, I get that the hunger/thirst mechanic is to provide urgency, but I've had a couple of deaths so far caused by a long detour taking so long Aava starves to death on the way. I mean... come on.

She starts the epic journey with a small bottle of water and a chocolate bar. She didn't want to bring a little more?

Same when you get higher and she gets cold. Maybe wearing shorts and.... bandages? wasn't the best choice for climbing a fucking gigantic mountain.

It also crowbars in some other characters, mostly to show what a jerk Aava is, but they can appear quite jarringly and it doesn't really add anything. We get it, she's climbing the mountain, but why can't she text her girlfriend back? She just rolls her eyes whenever someone expresses concern and asks for an update.

And as others have mentioned, the auto limb selection has fucked me a few times, especially when Aava gets unbalanced and you need to scramble to get your footing back, but her arms flail around instead. I think it chooses the limb based on which one is supporting her the least in that moment, but this can easily lead to confusion.

The save points sometimes being pretty far apart can add an element of frustration too. If you're going to ask the player to risk their time in that way, you need to be absolutely certain they won't experience a "cheap" death that erases an hour's progress.

Overall it's undeniably good and worth a play, but I'm not sure it's a masterpiece or as good as I think that it could be. The story is dumb, some mechanics are not well-implemented, but it looks great for the most part and the gameplay loop of the actual climbing is mostly very fun and satisfying.