There's definitely room for improvement, for example making a road that matches the ramp thing, make the ramp out of ramps instead or smooth it out using plates, make the buildings a bit more distinct and different, and make the tunnel appear more natural. I do like how the other details look, such as the fallen road and the porta-potty. Although it probably plays fine, take into consideration putting more detail into how the background elements look because that makes playing on the map much more memorable. I think the level of quality in the background you have is fine however I believe it needs to compensate such by being a larger map.
