afaik, carmack is working on a Haskell implementation for wolfenstein 3D. this might have been his excuse to start that project.
there is a really primative FPS shooter up on the haskell wiki, but its really not well structured.
To be fair, it is the world's first 3D FPS written using a functional reactive programming style. 8 years ago. By one guy who was learning Haskell. In 8 weeks.
While writing his undergrad thesis at the same time!
As a Nemesis/Gradius fan I love this; https://github.com/tanakh/monadius/blob/master/readme-e.txt I have been planning to make it cross platform but didn't find the time yet.
I'm particularly excited by the updated OpenGL and GLUT bindings. Graphics is currently not Haskell's strong suit, but I think this might soon be changing. There has been plenty of work on high-level things like functional reactive programming (FRP), but this isn't all that useful without the low-level libraries for actually drawing to the screen! These updated packages should hopefully make writing graphics programs in Haskell much nicer.