Right then, all done.
I didn't start until Friday 24th so did Friday evening, Saturday, Sunday, Monday, Friday evening, Saturday, and now my final day Sunday the 2nd.
I got quite a lot of my list done. The main thing I didn't do was randomly generated levels. I decided to just forget that because by the time I'd got gameplay working I wasn't confident I'd have time for figuring out generating levels too. So I built 3 levels instead.
Biggest hurdles were the camera and fish spawning system. Both are on their 3rd or 4th iteration now.
Here's a link to play the game (it's 2 player so ask your nearest nautical buddy to join you)
Here's a wee screenshot of the game: