Nifflas

[2] Within a Deep Forest[3] is a freeware game, taking place in the year 2500, after a devastating war has left the Earth a desolate wasteland.

[4] Bigdownload.com highlighted Nygren's minimalist sound and graphics in Within A Deep Forest, and praised its sense of frustration and emotion.

[5] The name Knytt [ˈknʏtː],[6] which roughly translates as "tiny creature" from Swedish,[7] comes from a character in the book Vem ska trösta Knyttet?

[8] A peculiar creature living on a unique planet, the Knytt is abducted by an alien in a spaceship for no apparent reason and taken into outer space.

It is up to the Knytt to venture courageously through the various types of terrain and caves on this planet to retrieve the pieces of spaceship so that it can return to its home.

In 2010, based on the source code and with support of Nifflas, a remake of this game was created in the C programming language, which resulted in a port to Nintendo DS.

The eponymous Saira is a photographer who, as a result of a mysterious accident, found herself as the only remaining person in the entire galaxy and has to find out what happened.

Saira features six endings and a unique graphical style that combines traditional 2D animation with high resolution photographs taken by Nygren—the press-release stated that the game was "developed almost as much in the outdoors as indoors".

In May 2010 Nygren released FiNCK ("Fire Nuclear Crocodile Killer"), a 2D puzzle platformer inspired by Super Mario Bros. 2[26] and the indie game Lyle in Cube Sector.

The game takes full advantage of the Wii U GamePad by allowing players to control a complex fictional spaceship via the touch-screen, switching between different engines and adjusting the ship's settings and landing gears to advance through the various levels' obstacles.

[34] Apart from contributions to the original scores for eight of the games he has made, Nygren has also created seven stand-alone albums of ambient music.