Gritty dystopian fantasy romance

Theodora Vearin has a way with forests, blossoms, creeping vines, composting, paranoia, and sudden death. She sees deception in every shadow, a trap in every word. She knows that promises mean little and the universe has always been someone else's manipulative game, but when she makes a promise to save the life of a childhood friend, it becomes a promise she cannot keep or break without breaking her view of the world.

Setting & themes: post-ascension Earth, symbiotic demons, weaponized silverware, seeking the heart of the World Forest, with a little help from my friends, the confusing lives of mangrove trees, curious river witches