Ok so hear me out. Mathematical expectation for a sum of 3 dice is 10,5 (since it's 3,5 for each die), this gives us an optimal strategy in terms of maximizing our chances - look at what you have, add 10,5 and compare the result to what the pirate predicts.
While the game might be very simple, the art, music and soundeffects all combine to create a good gamefeel. It is a finished (if maybe small) product with no bugs, or other issues, that looks and plays great.