https://github.com/xzpeter/starwar is neat, and easy to run. I couldn't figure out how to play, but it does something interesting in not a lot of code.

The directions are a little more complicated than they need to be. Here's what worked for me:

In the shell:

1. cd ~/quicklisp/local-projects
2. git clone git://github.com/xzpeter/starwar.git

In your REPL:

1. (ql:quickload "org.xzpeter.game.starwar")
2. (org.xzpeter.game.starwar:run)