This is the first Keen game made in Java. The engine is great, with nice pogoing and ledge grabbing. If you don't like the physics of it, it allows you to change the settings. It's a really well designed engine, although I can't really think of it as a game yet because it has no name, plot, or new graphics yet. You'll need Java 1.4 to run it. It also comes with an editor for you to make your own levels. On top of that, it is even open source! No Screenshots