Where to go now
Normally, each chapter ends with a summary heading; anyway, this time I don't think you need a summary. I mean, you made several games, from a Concentration to Sokoban, from an endless runner to Globez.
First, I want to thank you for reading the entire book, and I hope you enjoyed reading it as much as I enjoyed writing it.
Although you created several games, this is just the beginning of a long journey into cross-platform game development.
First, you should complete the game by adding sounds, a scoring system, and some other features I am sure you know how to add, now that you are reading these final pages.
Then, I just want to point you to three sites you may find useful if you want to dive into cross-platform HTML5 development.
Protect your code
As your games were written in JavaScript, anyone can look at your code simply by directly looking at the HTML of your pages. There are several tools to obfuscate your code to make it unreadable—or at least to make life really...