Get in direct contact with the creators via Skype to chat about the game and keep up to date on developement progress!
Also, get copies of the final game with exclusive Kickstarter content (Duckfoot Pistol, Customized Sail Color) for yourself and three friends! Plus one copy of the beta and alpha when they are available.
As co-producer, you can get as involved as you'd like! Meet online with the developers, design a character in the game, and have your name in the credits. Plus get everything listed in the Captain's Crew reward.