Just a few words on this one.
I read the first novel in this duology, Seraphina, and rather liked it, despite myself. It was a fresh, attractively written novel, albeit one with some real irritations about it.
Most of what was good about Seraphina is still good about Shadow Scale. Most of what was bad about Seraphina is still bad about Shadow Scale, though thankfully the valorised self-harm body-image thread has been set to one side. And also, to be fair, the incredibly creepiness of the romance has been toned down too, mostly by keeping the love interest off screen and silent as much as possible.