I think that this game does give death a fresh perspective. Even though the protagonist's sister passed on, the protagonist, through their memory of their sister is freed from mental constraints (of needing to obey social norms) and their life can properly begin.
Spoilers incoming, but personally, I chose to grab stuff so that the protagonist can be 'haunted' by her memory and strive forward. I mean, even if it hurts a lot, it's better to remember than to regret later on.
The storytelling format is pretty experimental because the backstory is told in fragments based on what item protag inspects. I like how the more you dig deeper (open boxes) the more intimate it feels. And it's funny to imagine the poor protag lifting maybe 10+ items out of the attic, so I hope that they are buff enough in-universe to do so.