I still feel like there should be a damage dampener upgrade, even if it only reduces damage dealt to you by 1 to a minimum of 1, and can only be bought once.
This game seems like it could be a real good one. It uses a different type of power to help the player get farther than in most other running games, and I support that. A few small things, as others have stated, are a little bit of a problem, but it looks like it has great potential. Maybe add some purchasable item that makes it so that fuel and/or boost shows up more than it did (even if only a tiny bit of an increase in their spawn rate).
Things to remember when doing close-quarters (Pirate) battle: 1, you're men are a LOT stronger than the other ships men (you can kill over 6 pirates with 1 pirate basically). 2, you have a lot more casualties if you're combating multiple ships rather than just one (try to drive away if another ship tries to help fight you). 3, doing pirate battle makes all the gold on the enemy ship stay safe, so you get more cash than shooting it from a distance and break it, losing quite a bit of cash during it.
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Awesome! I hope you liked the rest. :P