I'll be honest, I felt a little torn on the demon kitties. I immediately thought of an old cartoon when baby kittens being all sweet, but turning evil whenever someone wasn't watching them. Once I found the inspiration, it made more sense, but I think for the tone of the rest of the work it might have been better to just call them Demon Cats or maybe just Familiars. That said, it was very clear how the covers inspired the work and there was nowhere that I felt like I had to wonder too hard about what was going on. I think the random element to entry guardians felt a bit unnecessary, but didn't really detract from anything.