I really enjoyed this series. I am not familiar with the game it is based on and it seems that you don't really need any previous knowledge of the game to enjoy the show.
The animation, story, characters, world-building, are all solid. It's an easy to follow story that focuses on just a handful of main characters. I've noticed a trend of recent Anime series focusing on dozens of main characters without much focus (e.g. Seven Deadly Sins) and it felt good to focus on about half a dozen characters, each with their own story arcs and character development. All of the main characters are well-rounded with motivations that make sense and some possible plot holes are explained and fixed as the series progresses and gives the viewer more information, which I think is a nice touch. While it isn't necessarily groundbreaking, it is a great series that hits the mark more often than not and is another solid addiction to the Netflix Anime collection.