Thank you for the feedbacks.
For the lights and shadows, I suppose that it is related to the use of the ambient light. I tried to make differently but that did not give a beautiful effect. I think that ambient light decreases the contrast of the map and gives less marked effects of lights.
As regards the number of player, I also think that one needs few people. In fact, it is a map for a small lan-party. But Eggandbacon map isn't large either and we play with a lot of people, so why not. If FPS are allright, that could be funny.