Except for the second-to-last panel. Why would their partner say that "it's nice" that they're depressed? Maybe it somethin they're thinking but (if it is) it's shown in a confusing/misleading way.
I take it as their distorted reflection of themselves in that moment, starting to regain their humanity in their own eyes.
As their (assumed) partner said, "you don't look like a deer to me". Taking that with some assumed weight, we're looking at how this person sees themselves. Something weak, helpless, prey. They can't do anything besides try to keep surviving.
It's in taking the time with others, being treated as a person, they begin to feel it, see it once again.
i mean turning into a normal deer rather than a massive monstrous beetle is a slightly better start to things
on a scale of curses this is like a 5/10, definitely gonna change your life and fuck up a lot of plans, but it's better than being a quadruple amputee.