Esem is related to 2 different artists/bands:
Marinov was previously a member of the demoscene tracker group NOiSE. He also sometimes releases under the "eesn" moniker.
He has so far released one vinyl single (Ikae, vinyl-only) and three full length albums: Enveloped (deFocus 2002), Serial Human (m3rck 2003), and Scateren (on Kahvi in October 2005), as well as the digital-only EP "Aquanaut" (December 2013).
Scateren was released under a Creative Commons license and is available to download for free. Portions of Scateren were licensed for a Nintendo DS game - Theta, produced by Vitei inc.
Some of his music can be played over the web or downloaded from his website.