Taking her work further into the electro pop genre, Meyer-Landrut worked with a variety of new collaborators on the album, including production teams Biffco and Beatgees, who would contribute a more electronic, bass-heavy, experimental and danceable sound to the album, along with club sounds, dubstep elements and computer-generated retro effects.

[4] The album earned largely polarizing reviews from music critic some of who felt it lacked variety and individuality while others complimented Crystal Sky for its international sound and compared it favorably to English singer Ellie Goulding.

Further she worked with AFSHeeN and Berlin production team Beatgees who already produced a remix of "Neon (Lonely People)" and the children's song "Schlaft alle" for the compilation album Giraffenaffen 3 which was released in November 2014.

The next single "Wild & Free was released in September and served as the title track of the German comedy film Fack ju Göhte 2 (2015).

The 14 new songs don't rely on catchy tunes and sure-fire airplay, but rather on intricate electronic landscapes and abstract beats, which often only unfold their magic on the second listen.

"[10] WDR 2 critic Oliver Rustemeyer remarked that "for its diverse influences from home and abroad, Crystal Sky is extremely homogeneous.

"[7] Münchner Merkur critic Marco Mach found that with Crystal Sky, Meyer-Landrut "reinvents herself and presents a courageous electronic and danceable glittering work [...] This is a new Lena who is sure to scare away old fans and win fewer new ones.

"[14] Sebastian Zabel from the German issue of Rolling Stone magazine gave Crystal Sky two and a half out of five stars.

"[9] Similarly, Frankfurter Allgemeine Zeitung critic Hannah Feiler wrote that Crystal Sky was suitable for the masses but lacked "individuality."

[17] In 2023, eight years after its original release, the album was eventually certified Gold by the Bundesverband Musikindustrie (BVMI) for shipment figures in excess of 100,000 copies.