Pretty solid map. It looks very warcraf-ish.
The layout is unspectacular, but that's not ncessariy a downside . Items and creeps are overall balanced (for exceptions see below). Trees are perfect too, only a kotg needs to be careful to not have his treants be stuck.
However I share @Knechts concerns about the ramps. They really could lead to confusion, and even though the ramps in wc3 are not really "pretty" by any means, they at least get the job done of telling players exactly where they. Since players are used to it, I would put gameplay first and make the ramps less smooth.
About the creeps: Overall there are a lot of bandits and wizards. Some more variation would make the map more interesting.
About the items: A lvl 2 + lvl 1 powerup from the kobold spot really doesnt feel rewarding at all. Probably better to go for a lvl 2 permanent (+ possibly and additional lvl 1 powerup) instead.
Nevertheless, none of these are real bugs and as said before, balance is good. Map approved.