I love the beginning imagery. Something that stuck out to me was the ‘strong wood’ opposed to the ‘furious, zealous wind’. The wood (from the cottage & tree) seems to symbolize the strength of the love between the man and woman. Outside factors (such as the war) attack their relationship "but the wood is strong”.
I also really enjoyed your use of contrast. You can imagine the innocent, playful nature of children getting into mischief with no real consequence. Now that they are grown-up, the laughter is replaced with loathing and the consequences are quite deadly.
The build-up and use of repetition to reach the line “And most of all, she misses him” was superb. Well done.
The internal struggle is relatable to a lesser degree. We've all had the experience when something isn’t going according to plan and we start to imagine every awful possibility coming true. I think this is part of why I found the story enthralling. It was very easy to put yourself in their (snow)shoes.
I was captivated by the story because of the “Oh shit!” reaction it caused. The devastation hits even harder since you can see everything would have worked out if the characters didn’t do a certain action. Like mizal mentioned, they both probably would have died in the avalanche. A reunion to die together would make a happier ending (Star Wars: Rogue One), so I’m glad that didn’t happen. The heartfelt, somber mood and weather symbolism fit the story exceptionally well. The moment she pulled out the letter, I knew I’d have to break out the Kleenex box, get the ice cream, and throw on the Snuggie.
A few lines that you might want to revisit:
"The writing is hard to read due to all the tears that have wet it in the past, but she remembers it well"
– tear-stains seem a bit cliché to me
"So he does what any smart man would do, turns and starts running.
But soon after he hears a voice calling him, clearly terrified. Her voice! He turns once more and, without thinking, runs right into the avalanche, trying to save her when he can’t even save himself"
– The use of ‘turns’ stuck out. Maybe you used it multiple times to emphasize the several switch in directions. Maybe there’s a better word to use. Maybe you like it and if so, don’t change it on my account!