Originally a mod for UT2004 it's now developed itself into a full retail game apparently both single and up to 6 person co-op multiplayer.

the game fetures 9 types of enemies but unlike Left 4 Dead's linear gameplay style the maps are very open with the characters being the ones able to create choke point across the maps with tools such as weilding gear to keep doors shut! ~ to a point.

weapons are in the number of 16: 2 tools, 4 melee, and 10 firearms

If you see the later trailer you should see a chainsaw being used which isn't listed on the wiki page as it was removed and now seems to be making a return.

Price is £14.99 RRP but for pre-orders the price is £11.49.

I personally am unsure of this as it looks good, but effectively could be described as a mod of L4D's survival mode in my eyes and i already can only take so much of survival mode. however the increased weapon count, the approving nod to berserkers with melee weapons and varied creatures could reel me in yet.

Links:-

Main game site and trailer
http://www.killingfloorthegame.com/

Wiki Page for more info
http://en.wikipedia.org/wiki/Killing_Floor_(mod)

Post thoughts and feelings (game-related please)

It's moderately interesting, but possibly a bit expensive for what it is.