I think some moving on the bottomroute will be very difficult, players will run top bridge because of the advantages. Try to get the moving on the bottom much smoother, it seems to be easy-nadeable, middle route needs an advantage to top route which is more fast and safe, so it would be nice with a little island in the middle as a place to hide (like a bunker or sth like that).
That was gameplay, now to the look of the map itself: map looks very empty, you seem to care first for the layout, that is good
I want to see this map finished, it will be very cool to see, what is new on the map, it will be very different from normal defaults