So, I just downloaded this, not having played it for some 6-7 years. I completely forgot how well-made it is. The stage design is amazing, Kirby's abilities are put to great use, the animation is incredible for the time and system, and Extra Game is seriously hard. Whispy Woods in this mode is probably the hardest boss in the game, or hell, the franchise as a whole. WHISPY WOODS.
I love this game. It's platforming perfection.