Map is too small and because of this it now lacks strategic game-planning.
Terrain is cool, but thanks to the tile variations only, by this scale you should merge some astonishing felwood/ashenvale like settings like fog, environmental doodads, etc.
The problem with the game's tactic movement is that the map is too small, fast hitters and a steady damage force can wipe out the weakening player in a few minutes, creep camps is low so heroes can only gain levels 1-3 only.
There are no adhesives to the game board like goblin merchant, mercenary camp to supply players in times of need.
So in total, your map needs to expand more.