Pros:

Detailed map.
Straightforward
Interesting theme
Campaign Duration is Just Right.

Cons:

While great detail, the design gets really bland really fast
Finale and crescendo is too easy and escape boat is to far from finale start
Heavy reliability on Melee
Enemy spawns too high, even on normal

Conclusion:

I'm not gonna lie, I wanted to give this map a lower score but you have quite a few things right so far.  You just need some polish.