I just spotted this on Worthplaying and I know this might interest some characters here, so I thought I'd pass it along. I'm downloading it now, pics look sweet.

http://www.worthplaying.com/article.php?sid=17749

Edit: It's in german but it's easy to figure out. shift is fire and ctrl is secondary fire (shuffle weapons with spacebar when you pick em up). Looks like it's only 1 level though.