You really need to liven this map up. It is pretty plain, there are direct routes between the 2 starting areas and it looks, overall, rather featureless.
Needs more texture and height variation... A lot more....
There was far too much snow everywhere and no doodads.
There is a huge open area near the middle, you should at least put in a lot of doodads and texture variation here, though neutral stuff and trees would be preferable.
What is the point of all the water? You could just cut the map off there.
The facing angles of the creeps were weird. This isn't that important, but... well it looks weird.