Poor man's Super Mario Bros. 3.
Story goes that one afternoon Kirby's cake gets kidnapped and it's now a Kirby's personal quest to get it back. That's it.
Graphics are good SNES era quality with bright colours and nicely detailed backgrounds. Sound effects fit the action and soundtrack is happy and cheerful creating a light feel to the whole experience.
Gameplay is just like in Super Mario Bros. 3. There's an overworld, in which you progress pretty much in a linear way while completing platforming stages. At the end of each chapter there's a boss fight and then you move on to the next chapter. It's a tried and true formula, but in Kirby Squeak Squad it's not a least bit of interesting. Game is also short giving you approximately 5 hours worth of gameplay.
Unless you're a hardcore Kirby fan I suggest you to 1) download SMB3 from Wii's Virtual Console or 2) buy SMB3 for the GBA instead of getting Kirby Squeak Squad for the DS.