In addition to the above:
Terrain: I think the elevation of the blocks are a bit off'. Try choosing a block that has the same elevation effect viewing from all sides. You focused on square terrain, so that is what you should target on. However, I prefer Isometric because that would add to the realism and tension of the map.
Plot: First, I'm a bit lost on what to do. But then I found my way around. The gameplay was merely a cross and slash rpg, no specific engine or options and only usual attacking. There was really no reasonable 'objective' and no intense storyline.
Gameplay/ Text: The dialogue was weak, and continous repetition of the texts doesn't make the map seem 'smooth'. The zerglins are often just rougeing and dont even respond when I walk past. Just a small recommendation, when you switch weapons, I think removing the unit 'feels' better than killing the unit. Also you should play a wave when someone talks.
And also, add some sounds! They always supply a great taste.
Good Luck on this map
Edit: Also, the game is a bit slow-paced.