i started it up and thought, this is WAY too dark. however, i remembered what you said, and found a way around. and found that it is actually quite fun. (here's a hint: turn on dynamic lighting and use the battle rifle)
although you might think about making the spawn areas a little brighter, just to make it so you can get your bearings.
excellent map tundramagi. i also played your arena map, which is also very good.
Why has a developer ever needed any reason other than "it looks bloody awesome?"
-Archon