Escape From Booty Bay is built using the Enlightenment Foundation Libraries and is described as " a physics puzzle game in which players operate a cannon to stop pirates escaping from the prison. As players advance through the game levels, difficulty increases and new challenges are placed, like firing against moving targets."
EFL is the collection of Enlightenment libraries that make up the E17 window manager. "While their original intent was solely to support the window manager, the libraries quickly took on a life of their own, which is a contributing factor to the delays of the window manager itself. These libraries are so powerful, flexible, and easy to use that they present a strong platform on which to develop nearly any graphical application you could think of."
The game itself doesn't look particularly compelling or fascinating from any standpoint aside from the technical perspective that it makes use of the Enlightenment Foundation Libraries and at the same time the developers are working to improve these libraries. Those interested in learning more can do so from this blog post or the booty bay video embedded below.