The idea of the game sounds really fun, I love multiplayer games. I did go in and explore the map by myself, and found the level design could use some work. There were wide open areas that felt empty. Populating these areas would greatly help give the game a better finish.

In terms of level design, I'd recommend not only thinking horizontally, but vertically; having multiple heights one can traverse, adding verticality, would allow for more interesting map traversal. This can be as simple as adding staircases to raise sections of the town higher than others. 

The ground textures need some cohesion, vertex painting would really help this. Also having a transition texture, like a grassy cobblestone to transition between grass and cobblestone.