Hey,
the idea of the game is very good!

Ideas:
- A kind of grid in the build-mode
- Delete boxes in the build-mode
- Build stationary machine gun in build-mode
- Box gravity
- Different enemy classes
- Some player classes
--> Soldier
--> Medic
--> ...
- Build a map to see other players
- Join the servers out of the game and not with this starter-program

I think the game will be a very cool shooter!

Richi007