It's a swipe game. I'd call it a kind of Cook, Serve, Delicious lite. It isn't very difficult until the late stages of each career mode. Even then the difficulty comes mostly from the Vita not being able to keep up with the action on screen, or simply not registering touches. When you have to go back and swipe on the same ingredient for a fourth time in a row because the Vita isn't picking it up, you're not going to get that gold star. Or when the game freezes up for a half second mid swipe it completely throws off your rhythm, and again, no gold star for you. The only level I've had serious trouble with so far is the gold star on the final level of the beach career.
The 1000 crab trophy is going to be a grind, but not difficult. I only had the 500 crab trophy pop while replaying level 30.
I think I'd rate this about a 3/10, and that's mostly due to technical problems you have to overcome.