To be honest, I wouldn't have a problem with the anonymous nature of the map if you didn't mention it in the description specifically. Maybe you should just strike that and say it's "in a jungle" period.
If you
really think the map doesn't need any cover at all (?) then add something flat or a a detail in the skybox, some different lighting... Just to loosen the strict color scheme a bit. It was meant more as a visual detail.
The lack of cover could be fun, but I don't think you'll have to devote the whole map to a single gameplay idea. Getting shot out of nowhere for the 5th time in a row isn't that much fun at all and I'd be more than happy for a little change and trying a safer route then (which brings its own challenges).
I generally think that packing as much possibilities as possible into a map while keeping its identity should always be a goal. It's tempting to not change anything on a map once there's a nice flow of gameplay established but sometimes more IS more. I don't say that specifically about your map but it's something you should consider.