Nice map
Good I am not the only one who likes crystals.
Speaking of crystals and ice rocks
I think you, (without intention of course) are falling in spam a bit with the props and it looks rushed.
1) I think it doesnt look that good, sometimes less is more
2) I recommend you instead of putting a lot of crystals or a lot of ice rocks, try to make combination between each element so every time you create a micro unique element, also with crystals yes they are nice dont use it that much, you have to let the audience desire more, otherwise you can go to the other side and spam. It lose it unique and becomes common.
Since this is Lordaeron winter you have to take every prop from Northrend, ICC and Underground you can.
I recommend you to use waterfalls even small they help a lot.
I recommend 1 green creep more per player (or transform orange in green) . There are orange but the player doesnt now which are weak and which are strong while playing, the green light in the minimap gives you safty that with the hero and 2-3 units you can beat it without risking much (specially for unexperienced players).
With no other thing to say, nice mpa I rate 4/5