I absolutely adore the aesthetic of the dolls and the craft supplies, just seeing your progress pics in the discord had me excited to read this one.
You did a good job obfuscating the true nature of the angel. Ultimately my first assumption was right but you worked a lot of doubt into it as the story progressed!
Cece's ambiguity is fascinating, why does she care about keeping the angels alive if they're basically pests? Why does she care enough about humans to keep them around and heal them, but not enough to do it properly? I want to know more about her but I'm glad I don't. The story is overall stronger for keeping her inner workings a mystery.
I don't know if you plan to revisit this work at all, but if you're considering it I would encourage you to! I think with a bit more polish you could take this great VN and make it even greater!