Great ideaaa, cool and lookss good, congrats :3

It's a pretty cool game idea.  Would be nice to have 8 direction movement instead of just 4.  The enemy boats are kind of comical as they keep hitting each other, also makes their movement more unpredictable, which is nice. 

Ok, first of all- I'd really like to add my name to the leaderboard! I have the first place right now! I want those bragging rights :)

Over all- not bad. I like how the difficulty escalated, and how the container ships could move one another. 

What I didn't like was that you could only move in four directions. I found myself  pushing two buttons to diagonally all the time.

Also- any game that calls me 'laddie' gotta be good :)