I love this writing, as soon as i started reading i envisioned such a dark world. The first word that came to my head about this writing was discomfort. When anybody is ever in a regretful or guilty state they would say it’s a discomforting feeling. I would name this writing Dark Discomfort
Their entire job is to cover things, so yes, i think they should. This may be a controversial topic, however, If they don't like it, they should find another job.
In the case of the sentence "Although Amelia was quite lithe, her sister was clumsy and awkward" the unknown word is "lithe" and this is mainly explained by the conjunction "Although " and "her sister was clumsy and awkward" that shows the word "lithe" is the opposite of "clumsy" and "awkward" and indeed "lithe"