Sailing ships don't go backwards. They also don't go diagonally against the wind. If the AI can do that, the player should be allowed to, as well. Otherwise, nice concept. But only 3/5 due to imbalance.
When will game writers learn to offer separate controls for music and sound FX? The FX can be useful for play, but I get so tired of the lame synth crap over and over again.