The basis of the Decision Engine is combining my love for comics and choose-your-own-adventure stories. So in this case it shows you a story panel and two decisions. When you make a decision, the decision becomes the new current story panel and two more decisions appear. I coded it so in addition to the two choices, one choice may become available as well (a story progression panel, not a decision panel).
Update 1/22/2012: I got the FTP setup and finally uploaded the game over at Shen Games. I was at the book store today and thought about expanding the engine a bit more into a site that would be able to run the code, upload your own images, specify your own screen size and so on. Then I realized that I don't know any PHP or backend stuff at all. I wonder if I'll be able to find the time to create a full-blown COYA story down the line.
This game isn't very interesting story wise, but was more of an engine exercise.
Play the Game: Decision Engine