Thanks! What's funny is the AI is incredibly dumb (it picks a foe, fires somewhat randomly, and tries to stay within a certain distance of its foe), but because of the interplay of all the NPC boats crowded together and the waves, they sometimes appear to be smart.
Re: sounds, I wasn't sure how to get nice wave/splashing sounds with my retro sound-generator (zzfx). What other sounds would you recommend?