Beautiful writing. I really felt the emotional weight without it ever coming across as too sappy or overwrought. I also loved the little poems interspersed throughout, they were very well-composed, and I think it's an interesting way to use interactivity to add other dimensions to literature without pulling you out of the story the way it might if you had the protagonist actually, in the diegetic narrative, showing us their poetry.
My only minor critique, and I hesitate to say this because I don't know whether this is fully fiction or based on real life events happening to a parent (if the latter please ignore this comment), but I did feel that the ending was a little bit abrupt. Not to say, I suppose, that we needed to find out what happened, but that there could be a bit more weight given to the not knowing?
In any case: The writing, storytelling, and emotion needed to really stand out given the medium/genre you chose, and they truly did. Wonderful work.