cool that you upload maps! Of course there is alot that can be changed, but try first with different trees and textures on buildings and ground for example. Just ask some of the boys for help, i think they gladly would help ;)
You have uncrossable walls and fences which are drawn so crudely that i can't see that they are uncrossable on the map. Also you don't use descriptions and your control placement is approximate.
Dang it, this stopped working forcing me to DNF. I agree with teddy, especially in the tree section, which may remove the very unrealistic tree hitting thing and will allow me to stop issuing * ratings due to that.