Simply put, it's a novel you read to pass time as you wait for whatever it is you're waiting for.
(This review is based on the story so far, written at the latest chapter of chapter 72).
The literary quality in the novel is awkward due to grammatical inconsistencies, and the blatancy of the author not proofreading nor editing his/her work.
The story started with a interesting premise, but is executed poorly throughout the progression of the novel. We're told the protagonist lived a rat's life in his previous world, but has a mysterious connection to the phenomena of his new world. It is interesting, but it seems the author is just parading with the novel with smoke and mirrors to make it feel mysterious but it truly isn't.
Speaking of character design, all the characters are templates. The MC is one-dimensional, with no progression in character nor was there any statements that allows us to better understand him or any other character so far. His character is set in-stone and will probably never have a slight deviation from the start of the novel, or allow us to understand him or any other character better.
The world background is fickle, just like a majority of translated novels. There's a lot of locations but they're never fully explored or at least given in-depth treatment to allow us to immerse in them. (The story is still in it's early stages, this just based on the story so far, hopefully it will change).
