Tried playing with 2 friends first of all we couldnt get to host and join any of our games. Tried portforwading 9995 etc.
Used hamachi and we were able to play.
After going up to level 2 and finding the other door that goes down to level 1 the game just freezes on the loading screen.
Not sure if related but game.log has this in it
Start game
Loading resources
Resource error: doodads/generic/trap_stalactite.xml: All doodad transitions must have existing from and to states
Loading Language
Initializing game
Resource error: : Could not find file: E:/Installed Programs/steam/steamapps/common/Hammerwatch/assets/levels/menu_2.xml.bin