Quite Good!
This game is a take on the aeronautic games like "194X", but with a nautical twist.
Now, using the name "Captain Jack" is, as always, totally disingenuous. We all know what Pirate franchise you're alluding to - and are not a part of.
The text in the game is also painfully badly written, to the point where I hope the artist is a non-native English speaker.
However, the graphics are spectacular, the water effects breathtaking. The gameplay is intuitive and creative; the movement of the ship is neither simple nor difficult.
While this is perhaps the best possible game of the genre, it has limitations and certain pitfalls that can frustrate lower-level players.
Overall this is a good, solid game and worthy of attention.