The only problem is you can't play boats because they always score at least 1 point in the sea. If it doesn't mess up the balance, a better rule for boats might be "1 pt for each square away ... minus 1 pt" like forests. Maybe with a bonus point for each square beyond say 5.
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Fun game, I'll be playing often!
Small thing: the third phase of cards ends with the counter showing 2 left, so there are 8 items instead of 9. All the screenshots I've double-checked have 26 items in total. Could either add in those final cards or fix the counter.