I had a bit of a play of and noticed that in a 2 player game, the players sometimes get stuck when 1 is walking near a door or walls and the other player gets too close.
Yeah, the collision is a bit iffy... looking at it. I thought I'd written in if the collision circles were overlapping but you were heading in the other direction you should move. That's not working... Need to fix that bit. Also, are you meant to be able to pick up more than 2 guns in the version so far?
You can, it's just that the players are not set up to at the moment, you can re-jig the player.txt file to change their properties.