Selecting Gutsu's Cart would bring you to 2 unlocked power-ups, namely:
Bomb Deflects - deflects bomb when you hit them.
Berry Blasts - earn 5 points when you slice this special strawberries.
In order to get these power-ups, Starfruit points (SP) are needed which is earned while playing the game or you can simply buy it.
Also, you can now unlock all blades and backgrounds in the Sensei's Swag by using accumulated Starfruit points (worth 1,000 SP each). Some blades and backgrounds, however, can be unlocked by finishing a game with specific number of points and certain conditions according to the given clue or objective. Here's how to get some of them:
Mr. Sparkle Blade - 42 is a number that represents life in the game. Finish with 42 points.
Old Glory Blade - 50 stars in the US flag. Finish a game with 50 points.
The Firecracker Blade - Battle of Red Cliffs was on 208 A.D. Finish a game with a score of 208 points.
I Heart Sensei Background - just follow Halfbrick Studios on Facebook or Twitter.
Enjoy the game, folks. Yahweh bless.