Look to be clear this is a light novel. Maybe it doesn't look like but the title of this should be. 
How I ended up in the dungeon with nothing but my cat, underwear, and dynamite. 
Taking this book as what it is. It's tremendous fun. The action goes fast enough to almost make you forget how horribly bleak the setting is. It's a decent take on the genre and compared to something like solo leveling, omvient readers viewpoint, or even any power scaling dungeon, crawling book it comes off less serious and more lovable. 
Now to be clear this book comes with a pretty big list of trigger warnings. If none of those bother you and you want something fun. It's a pretty good read.