I just completed chapter 11 and noticed some issues.
First, the score text is not wide enough to fit the whole text, it cuts the score number out.
The main menu buttons also looks a little bit smushed.
Maybe these problems only appear on HiDPI displays like my 27" 5K display.
The method AddRobotKillToScore was created but never called.
Besides of these and other small problems, the book is really great and fun to read/learn!