Done. 2 stars since it was okay. Also, it has been abandoned on Royal Road and cannot be found anywhere else.
Just know that about half the chapters have technical or biological stuff in them that is not relevant to the book. This is not meant to be a pure story. It reminds me of a really good speculative exploration of an alien planet documentary that I saw years ago.
Chapter: comments (there won't be any spoilers) 1-6: boring technical descriptions, clinical dungeon expansion 7: other viewpoint, tens of new geography and political terms with no context, hard to read 12: why do I need to know the precise internal layout of a room? It's not relevant. 17: I'm sensing a pattern here. Why do I care about the precise layout of the miners' tunnels? 19: At least the book is consistent. Detailed analysis of how to build a drive train for a wagon. I'm thinking that this just isn't my type of book. 19-21: Biology analysis and logistics
Meh. This seemed like it was going to be pretty interesting until the protagonist became inconsistent and the story inevitably started revolving around human side characters. The cautious genre savvy protagonist decided go back on his thoughts by breaking through to the surface. Then he recklessly befriend humans to 'subtlely' pump them for information and materials.
For a dungeon core story featuring a first time author, this is a 3-4 star well written story.