This was made for my CoderDojo students. It gives you a simple working game to start and then shows you how to improve it by adding nodes and code step-by-step. It is intended to be printed out and taught by a teacher who explains the code, but if you've coded before you can probably figure it out on your own.
Advert: My game RetroWar: 8-bit Party Battle
Bonsaiheldin | http://bonsaiheld.org https://opengameart.org/content/stars-parallax-backgrounds
http://millionthvector.blogspot.com/