The authors clearly have enthusiasm for the game, but I can only assume this same enthusiasm distracted them from the much-needed task of getting a proper editorial go-over for this book (pun not intended).
It has a decent start, but the structure is largely a mess. There are too many instances of concepts being introduced in the midst of explanatory sections of other concepts which the authors acknowledge are important but "will be discussed later". Not exactly scoring points for having a beginner-friendly layout of content here. In addition, the wording for many of the exercises is vague, and the association between many of the diagrams and their descriptive paragraphs is annoyingly unclear. I get that diagram markers aren't fun to include, but they exist for a reason.
The game still intrigues me, but this book doesn't do it many favours.