Enigma
Enigma is a completed top down zombie survival game written in Java.
...When we look back at Enigma, we realize that when we started it, we knew next to nothing about object orientation, inheritance or the lack of efficiency of some of the techniques that we were using. Throughout the time we spent on it, doing extensive external research on topics such as pathfinding, raytracing, and rendering, we learned quite a bit about the Java API, programming in general with various techniques and how to do them efficiently, and last but not least, how to work as a team.