Demimonde is the one-man game development studio behind OCTAHEDRON. The studio’s creator Marco, also known as Monomirror, is solely responsible for nearly all aspects of the game, including design, programming, and art.
Based in Zurich, Switzerland, Monomirror is a musician and sound engineer by trade. He works part time for music label Brave Wave Productions as Associate Director and Sound Engineer. Most recently he’s worked on their Generation Series brand of video game soundtrack remasters, restoring the Street Fighter II soundtrack and bringing it to vinyl and CD in collaboration with Capcom.
Source: The Developer Website.