This is fine as an introductory analysis into the means and craft of stories in video games. There is some basic explanation of the evolution of the techniques, as video game technologies themselves evolved over time. The meat of the book is a breakdown of storytelling drives into several categories, each one holding its own position regarding the degrees of player interactivity, and how that can have an impact (or not) on the story outcome itself. There are many examples of video games, each one being given several paragraphs of analysis and highlights of its story and setting. That's a great way to underline the importance of the point being discussed; congratulations! At the very end there's even a pie chart of questionnaire results, clearly showing how the player audience are satisfied with, and ready to pay for, storytelling techniques in video gaming.
It's a great book, particularly for people trying to get into video game production and content creation, or even as reviewers. For the more academically inclined, I wish there was some more analysis or insight regarding how each storytelling technique interacts with actual psychological and neurological factors inside the human mind. That would certainly enhance the secondary point being discussed in the book, regarding how video game is faring and is going to evolve as a fine art of its own.