Yeah, without the extra mode the game really is much, much too short and easy to be worth whatever price it commands (and I'm sure it's substantial). I think it's the only game of its era that I beat the same day I started playing it.

With the extra mode, it's more acceptable, but sticking with Kirby's Adventure, Kirby Super Star, and Kirby and the Amazing Mirror (and maybe even Kirby 64) is the way to go. (Kirby's Dream Land 2 and 3 are pretty well done, but the slow, puzzle-based gameplay is a bit of a drag.)