It just seems like a single player melee map at the moment. Things you can include...
- A cinematic and dialogue between characters to describe what's going on.
- Custom units with special abilities would spice up the gameplay.
- Maybe add more cliffs with ramps and using the raise/lower tools to make the terrain a little more fun to look at.
- Filling in the terrain with shops, more trees winding around to create something of a maze to walk through, etc.
- Side quests from NPCs around the map - can be as simple as being sent to kill a powerful unit or group of enemies.
In all of your quest information, 'destory' should be destroy. There are other grammatical errors, but I'm guessing English isn't your first language. I wouldn't worry about grammar too much until you have more of a polished version.