So, full disclosure: My exposure going into this VN to the various ideas, tropes, and images associated with the Empty Spaces genre was minimal at best. My takeaway after reading it, however, is that it's not strictly necessary to be familiar with ES to follow along with the tale of our ill-starred dolls~ Likewise, you don't have to know anything about the genre to be able to appreciate the charming art this VN has to offer, either, heheh.
That being said, there were a few things that didn't quite add up for me. As I understand it, the concept of a "doll" in ES involves someone effectively relinquishing their autonomy and personhood to someone else, yeah? And the person to whom they relinquish it is typically a "witch," with the idea being that the witch can offer some manner of insight or protection to their doll(s), or is perhaps enchanting them and bringing life to the otherwise-inert doll through their "magic"? That's all well and good in a mundane setting, but things got a bit muddy for me once it was revealed that there was Actual Magic at play in this universe.
After all, if the witches here have literal magic wands (which they can order online?) that they can use to hypnotize or brainwash people forcibly into being their dolls, wouldn't that undermine the huge gesture of trust and vulnerability of a doll giving themselves up to their witch of their own volition? Granted, I understand there are metaphors at play here—like I mentioned before, there's the idea of the witch having a sort of charisma or natural magnetism (or skill at manipulation, perhaps) that draws dolls in, in a way that might border on magical—but the implication here seemed to be that there was no choice involved whatsoever, especially once wands started getting waved and sleep & transfiguration spells started getting thrown around, and doubly so once the dog was turned into a doll that way, heh. I also found myself wondering why Garbage felt the need to endanger herself by trying to steal and use the witch's mundane scissors specifically, rather than using the leftover money after the bus fare to buy some cheap ones from a dollar store, as well as the logistics of how, exactly, Garbage spied on the witch for multiple months...
Buuuuut I don't want to nitpick at the metaphors and minor details too much. It's clear in any case that a lot of heart and deeply felt emotion was poured into this VN, after all~ Nicely done!