Nicklas “Nifflas” Nygren is a Swedish game developer. He is the creator of the Knytt series, as well as various other games. Some of his most notable include Within A Deep Forest, Ynglet, and Uurnog.
As the original creator of Knytt Stories, Nifflas made the two levels which come pre-installed with the game: The Machine and Tutorial. He also created an additional five levels which are available for free on his website:
The former four are packaged together under an installer for A Strange Dream, while Gustav's Daughter is standalone. Initially, A Strange Dream and the levels included with it were intended to be published as a paid DLC, however, Nifflas later decided against that idea and chose to release them for free instead.