Hey sorry man, just saw this message this morning.  My evenings are a little busy this week, but I should be around on Friday (albeit, a bit hungover) in the afternoon and then all day Saturday.  Shoot me a friend request or I'll shoot you one.  Should be a good time.  I played it briefly last night with an open created game that no one joined.  It's fucking nuts.  There are 5 rounds with 5 waves per round, no wave being easy, but the horde wave being the most insane.  After each round a restriction is placed upon you.  I only played through 1 round before the girlfriend made me turn it off to go out for dinner but, after it, a restriction was placed where criticals did less damage.  I've heard others like shotguns, combat rifles, etc...do less damage, or grenades aren't allowed, shit like that.  It seems like a very cool concept.
What character class are you playing as?