To make the map look better, try to add some detail to it. Try add some models from raw/xmodels and maybe make some walls broken and so on. And try make an outside of the map so it doesn't just feel like an isle floating in the air. Maybe also add an other visionfile.
Other then that good...

Update: 2016-03-14
-Added widows-wine
-Found the blending function: so a lot of detailing
-Getting closer to release.
[img width=770 height=577]http://i897.photobucket.com/al...

Okey ill try, but I remember adding a fix to the dodamage restarting in co-op( I think)

Ok thanks 

There is no kvp you easily could add to a trigger to to damage to players? Like riflebullet damage?