According to this thread:

g小调瓶子 is the author of this composition, based on Prelude and Fugue in C minor, BWV 847. Since it is now known, it turns out the game most likely has to soon properly credit him/her.

Although, with the author's name already written at the top-right corner of the piece, I don't think it is likely for Piano Tiles 2 developers to mistaken this composition as "Unknown". The same goes for "Penguin's Game", which the band name is known, GELATO.

Link to scores: (Chinese) (Chinese)

Author's baidu profile: (Chinese)