Well, seen as no real review is up yet, I'll post mine for those who are thinking of picking this one up. As mentioned, it's very much like the Fruit Ninja Slash/Slice or whatever variation you've played. Despite what's been said, I actually don't find this game as responsive or precise as the fruit version. You get used to it, but there seems to be a slight delay in when you touch the screen, and when the slice is registered. This can be a little problematic, especially where the smaller items are concerned.
Fortunately, this is one of the more forgiving games of the genre. To begin with, you can slice a fish 3 or 4 times, each slice yielding another piece that will fall onto an order of beds of rice. So rather than encouraging precise swipes, the game rewards the "swipe mash", the frantic and fast scribble swipe that can fill an order with just one fish, resulting in a cumulative price multiplier. Also, you don't lose a life if a fish is missed. The main game works with an order timer, which refreshes every time you fill an order of 4 pieces, which as mentioned, can be filled with a single fish if you can swipe mash quick enough.
The game works in rounds, with a bonus round between each. You'll accumulate coins for each order, which can be spent on power-ups, like new blades (some of which are tap instead of swipe based, like ninja stars), more potent in-game power-ups (timer freeze, more coins per fish etc.), and one time use items, like starting you at a higher round. The bonus rounds choose a single fish, and ask you to slice a certain number of them, throwing hazardous stinky fish into the mix which when accidentally sliced, end the bonus round. The goal of the bonus rounds is to achieve three stars of competence with each type of fish, increasing the value of the fish in the regular rounds, and allowing you to achieve higher scores and more money.
The second mode of play calls on you to fill specific orders. The game tends to be quicker, and the goal is simply to achieve a high score.
The graphics and sound in the game are top notch. The gameplay, while feeling slightly delayed, is what you'd want (though you may get a blister), and the unlockables and buyables are a welcome addition, giving you more to play for than mere score.