i think my favorite details in the game come from the ending stuff in regards to sissel
Firstly, the fact that in spite of him saving everyone, he still dies in the end bc when the fragment of temsik gets rerouted, it hits him in the back as a kitten, killing him like it did yomiel
And then the fact with since he's dead with the temsik, he doesn't grow at all over the 10 year jump since he's literally like schrödinger's cat
sissel and yomiel both being schrödinger's cats is such a fun thing. with yomiel it even ties into the Themes — after all, the whole idea behind the thought experiment (iirc) is that you don't know what state the cat is in until it's observed.
yomiel spent ten years not being really "seen" by anyone. and it's only after he's finally "seen" as a person — by lynne first, and then the trio of jowd-missile-sissel — that his fate is changed, and his future/trajectory is resolved. what is he? he's alive.
and the other thing you mentioned is great too. something about how there's no such thing as a perfect life without some hurt, some sacrifice. bad things will happen (and everyone will have different reactions to the bad things that happen to them). but if you have the right people beside you, you can live with it.