The character now known as Kirby was originally designed as a blob-like placeholder sprite for the development process prior to actually being designated the main character.
The only Kirby adventure game in which he doesn't have the ability to copy the powers of his enemies.
The color of Kirby was somewhat controversial during the release of this game (which featured the character's debut). Nintendo game designer Shigeru Miyamoto suggested that the character be yellow, but Kirby's creator, Masahiro Sakurai, insisted that Kirby should be pink; the latter was soon declared Kirby's official color. The Japanese packaging for the game presented Kirby as pink, but further confusion led to Kirby being shown as white on the North American box art. (It should be noted that the Game Boy system display technology of the time presented games in four shades of a yellow-green color.) By the mid-1990s, however, Kirby's pink color became the worldwide standard in all packaging, concept art, and game sprites depicting the character.
The boss at the end of the second world is Lolo and Lala. These characters were taken directly from another HAL Labs game, The Adventures Of Lolo.
The story of this game was later retold in the Spring Breeze sub-game of Kirby Super Star for the Super Nintendo.