This review by MeganRBooks is based off of the first three chapters. I am not a professional reviewer, so please feel free to take what works for you and ignore the rest.

Cover: 8/10

Your summary states that the cover was done by itsmarrose and I think it's quite lovely. The colors in the starry background offer an ethereal quality, which is fitting for a Science Fiction story. It includes the romantic theme of the couple holding hands, and I love the whimsical font styling and the clear author name.

Summary: 8/10

"Everything requires sacrifices." That's a fantastic hook! Your summary is among the best I've seen on Wattpad, providing a clear designation of the character (Fei Hong), the world in which she lives (leaving Earth for space travel), her current situation with her ailing grandmother, and the risks involved in moving to a new planet. There's an air of mystery behind "the boy with the grey eyes and a secret to hide", making me immediately curious about this stranger and how his dynamic with Fei Hong will develop.

Title: 8/10

What We Left Behind tells us right away that the sacrifice/risk in this book has to do with giving something or someone up, which is both heartbreaking and philosophical, lending itself to a suitable title for the subject matter. I love it.

Grammar/Spelling: 7/10

There are several incorrect instances of the usage of "it's" versus "its", so you will want to verify that you're using it in the correct context:

"its" (no apostrophe) for possessive. For example: "The story, despite its grammatical issues, is amazing."

"it's" (apostrophe) for the contraction of "it is" or "it has". For example: "It's a good idea to check your grammar."

In a couple of places, your word choice is unnecessarily complex (ie. evanescence — while it's a beautiful word that fits the context of the scene, it's uncommon enough that it feels jarring in the flow of reading. You already excel in sentence variation, structure, and vocabulary; using too many elaborate words takes away from the quality you've established.

Plot: 7/10

The story opens up with Fei Hong embarking on a twenty-year journey to Erisua, leaving behind a boy she cares about. After the prologue, there's some good world-building that includes wonderful descriptions of the buildings, culture, and environment. I would have liked to have seen a little bit more in the way of Erisua's history, but that can be added in later. The mystery of the boy in the summary is hinted at throughout the first few chapters, but very little has been unveiled yet. It'll be really interesting to see how this plot progresses.

Characters: 7/10

The single biggest issue in your story is a lack of character/narrative voice for your MC, Fei Hong. Even after several chapters, I don't know what she likes or dislikes, or basic things about her personality. There are places you could include those sorts of details and how she feels about things aside from the sadness of leaving everything behind. This can be interwoven through the narrative using a bit of inner monologue sprinkled throughout, or include opinions in with her observations. My recommendation is to create a character sheet for her where you can figure out every detail about her personality, then consider areas where you can include her memories earlier on (besides her physical memories of Earth, which are beautifully done), or how things on Erisua remind her of experiences she had with certain people on Earth.

I enjoyed the scenes with the grandmother and her failing memory. It's heartbreaking and realistic. I could really feel Fei Hong's love for her grandmother in how she talks to her and touches her. Fantastic job here.

I'm a little confused about the boy(s) depicted in the story so far. Are they all the same person? The grandmother references a boy with beautiful blue eyes, but the next chapter includes a sweet memory of a boy with green eyes. I have a feeling that you're deliberately leaving out names on purpose, but if not, then it might be a good idea to at least give the boy a name early on so he doesn't feel so vague and nebulous.

Her friends—Elora and Marice—feel very real, especially in the scene where Elora insults Earth and makes some insinuations, angering Fei Hong. They both have strong personalities—stronger than Fei Hong's—that are fun to read about. But keep in mind that you never want your side characters to out-shine your MC.

Overall: 7/10

Prologues are a tricky thing. They're not recommended in the publishing industry; in fact, many agents and publishers will reject you the second they see the word "prologue" without reading your manuscript. It's often used by authors as a place to dump in a bunch of background info that could have been woven through the first few chapters of the story. And in the rare occasion that a prologue is an integral part of the story, it should simply be called "Chapter 1" with any necessary time jumps occurring in Chapter 2.

I'm not convinced that your prologue is needed at all, but that's a personal opinion. While your writing style in your prologue is clean and appealing with fantastic examples of "showing" rather than "telling" the MC's pain at leaving a boy behind, it doesn't necessarily work for the reader. There's a lack of buildup—the MC is a veritable stranger to us, as is the boy she's leaving, and without any sense of her memories or personality, it's really difficult for the reader to empathize with the MC's current situation and the grief that she feels.

Additionally, the prologue jumps, or "head hops", from Fei Hong to the nameless boy (as he is "driven by the force of his sobs and waves of grief"), then back to Fei Hong again. I can see this working with third person omniscient POV (not recommended), but your POV in the rest of the book seems to be third person limited, and I suggest keeping it that way.

There's a tendency to use the cliche of the character observing her own features (where Fei Hong observes herself in the metal in the spaceship in the prologue, then observing her changed reflection off a porcelain coffee cup in the first chapter). I'd suggest removing at least one of these instances, though it was nice to see her thoughts on having to change her appearance through hair dye in order to fit into the new world where wild hair colors are common.

Your writing is spectacular, with unique world-building, subtle emotional moments, and vivid imagery. With a little bit of editing, this book will really sing. I can't wait to see where you go with it!

Thank you for giving me the opportunity to review your book.