"Kirby Squeak Squad" is very satisfying and enjoyable. The campaign and cutscenes are just terrible, but the gameplay is one of the most original concepts i've seen. A good DS game that will entertain you till the heart.
Stomach issues and assumption of Japanese linguistic ability aside, however, Squeak Squad is the most complete conventional Kirby side-scroller in some time. Yes, it may not be a "killer app" like Canvas Curse, but it's not trying to be.