yeah the game is like Kirby : Nightmare in Dreamland, you can suck enemies and acquire their abilities, but this time 3 other Kirbis follow you... they fight and press switches for you...
it seems very multiplayer-oriented too.
I like the 3 new minigames you can play multiplayer (still haven't tried but those game should be single cart - 1 cart for 4 linked gba)
The first is a fast reflex game, press the button first to eat apples, but beware of bombs!
The second you have to break the a rock and the ground as deeper as you can, by pressing with the right timing the "A" button
The third is like kirby air ride, but on the water! Push the jump button with timing to gain speed over the waves