Beautifully written and presented story with a very interesting premise. I must admit the "setting", for lack of a better term, felt fresh to me. It might be me not being super familiar with the genre, but I can't think of many other stories that feature a world where the climate and ecological disaster has already turned everything to shit, and the apocalypse is still so far in the distance that the characters can afford to go on with their normal lives. It's an interesting tension, I must admit I had some trouble initially because the stakes felt too dire (everything is dead) and not dire enough (and yet food is not a concern) at the same time. And yet it's a tension that mirrors the real world to a T and makes for a nice parallel to the emotional stakes of the story. The contrast between nature being described as dead and yet visually depicted as hauntingly beautiful still is also nice contrast.
The personal story worked as well, and everyone did their part: the prose was evocative, the music set the mood, and the art was impressive. There are a couple of points where I feel the story could have been improved, but they are minor points in an otherwise impressively woven tapestry.
My main point of criticism is that, with how effective the story was at hinting at things and establishing a mood, I think it could have resisted the impulse to spell out certain things as explicitly as it did. For example, the descriptions of the environment are so effective that what was going on was immediately clear to me, and yet the characters still spend a good chunk of their dialogue delivering exposition about the state of the world. Another example is when a clear parallelism is established between Owen and Robin, by having them repeat the same things, and yet the narrative still feels like it needs to draw that point explicitly by having Owen literally transform into Robin.
I wish there was a bit more trust in the reader being able to piece things together. For a contrast, I think the story did an amazing job at stopping just short of explaining the "fishing stakes". Arthur says he needs something to take the bait in order to feel closure, and it's up to us to realize that that already happened, he's already fished something out of the lake. Perfect!
Another minor point of criticism, somewhat linked to the previous point, is that while the narration is patiently paced and very effective at showing, it felt like the dialogue was sometimes speedrunning things and going for big sweeping statements. The scene where Arthur "opens up" is probably the biggest offender: in just a few lines we go from wailing about how the character is feeling, to talking about the protagonist's Asperger syndrome, to trying to convey who Robin was as a person in very abstract and general terms (he was so smart, kind, etc.). In general, I think the dialogues would have benefited from the characters interacting a bit more with each other, instead of taking turns monologuing.
Final very small nitpick, while I love the scene of Arthur remembering Robin and their time spent in the cabin, I can't help but wonder if it was maybe placed a bit too early in the narrative. Instead of immediately laying down the story's cards, I think it would have been more interesting to build up to that flashback.
It bears reiterating, I think you guys did an amazing job, this would be a 5/5 from me. I focused mostly on what IMHO could be improved because other than that I don't have much to say other than "Stunning work".