1. Terrain is nicely done, it is balanced and symmetric.
2. Item drops should be more balanced with the creeps level though but as for this, it's ok.
3. Nice use of water tinting color. You might want to use terrain fog and global weather.
4. Creeps are well placed.
5. Environmental doodads and the like are well placed, too.
With all these, I therefore vote for approval with a 3/5 rating.