You can shoot stuff
You can run around
You can shoot more stuff
So..
...
You know..
.....
Do that..
Download Here!
More info here
If a moderator doesn't play "Nicer post than this" before I get back from work, (and I remember about this post!!!) then I'll fix it up, and add screenshots and the like..
Meanwhile, enjoy, and feel free to suggest all manner of extras..