This was a very sweet way of honoring all the dead goldfish out there in the world. I was never a pet owner myself, so have zero experience in owning a pet and what it takes to have and care for one. However, my understanding is that for whatever reason, goldfish never seem able to survive long enough in anyone's household, so I'm not sure why they continue to buy them as pets.
That being said, this was very un-Lemony Snicket in my opinion, because of its sweetness, but also its straightforwardness. I'm used to Lemony Snicket sarcasm and digression when telling a story. The only reason I gave this 4 stars was because I couldn't really find Lemony Snicket's voice in there. Of course this is a children's book, and so it has to be short and to the point, but I still couldn't really feel his presence.
Otherwise, this is a great book to read to children, especially those who have pets. I liked the idea of the ghost of the goldfish journeying to find company, something we all long for, dead or alive.