Play this game if: You have a fondness for witty banter and a craving for short and easy games.
Don't play this game if: Just play the darn thing.
Something akin to a slice out of a fantasy/soap/comedy webcomic, A Day for Fresh Sushi is short, simple, and fun.
The main reason you'd want to play this - other than as a basic introduction to IF - is of course the fish, the feeding of whom is the objective of the game. It's an objective you may want to put off, though, because the fish's commentary on what you're doing in the meantime is hilarious enough that you may find yourself just trying to get him to react more.
Certainly not the kind of game one plays for a challenge,(Spoiler - click to show)since after all you can win in three turns, A Day for Fresh Sushi is instead an entertaining five-minute distraction.