The release contains a riddle/alternate reality game, there are different sections and parts that must be put together in order to get to the solution. The reward for finding it is a download code for a bonus Deathvoid song.
The final track of the demo, "Hierarchies Dissolve", has a morse code at the end, and it's the first step of the riddle.
More hints can be found in the info section of each track on Bandcamp and in the downloadable digital version, containing additional images and a .txt file.