Thank you very much for this book. It is one of the most enjoyable tutorial book I have worked through until the end.
Hopefully there will be a second edition 
which includes a small game, some Neural Network code utilizing the GPU through Metal.
Kudos to the authors for such a well done job.
@mjeragh we’re thrilled you liked the book! 
There will be a second edition for sure, however, I can already tell you there will be no Neural Network code in it because there is a Machine Learning book that just handles that part. A playable game is a possibility but we are focusing on rather trying to include more engine techniques that we had to exclude in this edition.