At GDC 2011 we had a chance to sit down with Chris Holt and give him a hands-on demo of Sketch Nation 2:
Sketch Nation 2 marries a kid-friendly “sketchbook” aesthetic with a plug and play game creation system. Through a handy set of menus that let you manipulate gravity, direction of scrolling, and enemies, it’s easy to create a game within seconds. You can draw a hero, platforms or obstacles for them to confront, and even bonuses for them to capture.
Read the full article here: http://www.macworld.com/article/158401/2011/03/sketchnation2.html