Welcome to Computer Game Design! I'm really excited about getting back to teaching this class!
The game engine we will use for Fall 2017 will be Unity.
If you want something to do over the summer, pick up Reality Is Broken: Why Games Make Us Better and How They Can Change the World by Jane McGonigal - Amazon. It's a great book and a relatively quick read. We'll be using it throughout the class.
Let me know if you have any questions!