TL;DR: Starts enjoyable but rushed, struggles in the middle, and flops at the end, making you glad the book is finally over.
This review contains spoilers and some harsh (and I hope fair) critique.
After the first 15 chapters, the book is a series of promises without delivery. It begins with a series of promises of what the book is going to be about:
1. Travel 500 miles through the wilderness
2. Survive in fights against the Exlian
3. Betrayal set up by Noah's father.
4. Get stronger.
All of this happens in the first 15 chapters, leaving the reader wondering how there could be another 30 chapters in the book. In those 15 chapters, this happens:
1. They make it to the mine
2. They fight Exlians along the way
3. Sergeant R buries Mark alive
4. Mark survives and makes it to C-Rank, gaining new abilities.
All of this would have made for a good standalone novel in the series, even knowing betrayal is coming. If it had been done correctly, it would have been a banger of a novel. Mark could have made friends with his compatriots, showed he was a valuable member of the team, earned the respect of his fellows, then have a "curse your sudden, but inevitable betrayal" moment at the end of the novel, before Mark uses his learned powers in a creative way to survive. We set up the next book. It would all work out. However, we get a somewhat rushed beginning to the story with these first 15 chapters. It feels bizarre as the next part of the story unfolds at a leisurely pace, and the narrative meanders.
I like the author, though, so I finished the book, although I almost wished I hadn't, because nothing significant happened in the last 2/3 of the story.
1. While Mark is surviving on his own, he meets a humanoid Exlian that he knows is dangerous, but it's scared away by Mime. Does anything happen with it? No! No fight later, while Mime can't help. He sees it, tries to communicate, and it gives him a headache. There is no conflict with the monster at all, but rather a tension that remains inadequately unresolved.
2. Mark learns there is an underground laboratory at the mine. It seems like the whole mining operation would interfere with the structural integrity of an underground laboratory, but that's fine. They probably figured it out. There's a huge threat down there with multiple Terror Exlians and a Nest. Cool, let's get out of here, head back to the city, and warn people. Do we go back to the city? No! On his way to the city, Mark meets up with a Ranger force tasked with destroying the laboratory and reopening the mine. So, back to the mine we go, just another broken promise to the reader, but at least the story is going somewhere, and we want to see a fight with the Nest and Terrors anyway.
3. They go down to collapse the lab, hopefully killing the Nest in the process. The two most powerful people have to fight the crab monster at the bottom, because... reasons. They are trying to blow up structural support beams throughout the lab, so that they can collapse it (don't mind the mining operation above). Still, the best healer and the super-powerful telekinetic mage both need to fight the crab at the bottom of the central stairway while everyone else tries to accomplish the mission. Also, why are we splitting the party? Do they not read? Anyway, we have the explosives, but they won't go off until they are all set, but of course, there's interference with the signal, and the bombs won't go off until the Nest is destroyed. There we go. Destroy the Nest, which is going to be our boss battle, then Mark can go home, and we'll resolve most of the story, but still have a cliffhanger at the end. Sounds good, right? Right? Wrong. There are still 10 chapters left AFTER THE BOSS BATTLE.
4. After the big boss battle, we have no more major fights for Mark. Stuff happens, but unlike other LitRPGs, the author subverts the typical progression storyline. In most stories, the main character gets stronger throughout the story, defeats the big baddie, and then is able to show someone (usually a bully) at the beginning of the story how powerful he is now through talent, hard work, and luck. In this story, however, we just get ten chapters of things happening around and to Mark, while he does absolutely nothing.
- Incoming horde! Does he fight? No! He watches the Exlians get destroyed by cool weapons. Cool scene, but Mark is a passive bystander.
- Incoming humanoid Exlian from point #1. Does he fight it? No! He gets a headache and goes back to camp. Mark is passive.
The last ten chapters or so of the story leave you feeling like Mark got a significant boost to his strength early on in the story, but that he never gets the chance to be awesome after that.
At the very end, when he gets framed for murder, the reader is left feeling as if the MC is along for the ride in his own story.
I will continue reading the series, if only because I enjoy the world-building and the combination of magic and science in the story, which is done pretty well. At this point, it also feels like a sunk cost for me. I'm in two books, and there are two more on the horizon with release dates. I'll read the next one and hope the storytelling in the next book improves.