Crimson Sea Cheats
After finishing the game you will unlock the EX mode option. You can play the game again with the money available at the end of your last game, and you will also unlock new items.
Repeatedly fail a mission to unlock the G-Squad mode option, which allows the game to be played under an easier difficulty setting.
How to beat the first Boss
By using your tracking system (push R). Keep shooting until he goes to somewhere else. Shuffle until you track him again and repeat this process until it he has been beat.