It's a thrilling series with lots of action. The world setting may be weird, but the games themselves are quite interesting. The way they deal with battle royales, like each one of them, is just a step for Yuuki. Even though most of them are quite deadly, the way they're depicted is actually good enough to keep readers wanting more. Yuuki's final goal is also really unrealistic, but that's just what makes this story even better. Slight spoilers The way Yuuki deals with some problems in the earlier volumes may feel a bit overwhelming, but most stuff is actually foreshadowing, so I would say that mostof it pays off later. Besides, since the author goes really fast with the number of games played along the volumes, it might be a series with not that many volumes when it's finished, but who knows.
Although a lot of characters end up dying in this book, there are always some of them being developed across different story arcs, even though any character may just die at some point.

Great reading overall.