Feel free to take a walk through the apartment at www.minutehour.com/pretorius/
In short, the idea was to make a game engine like any other, but that supports a lot of features that UE4 and Unity didn't at the time (I know that few recent updates did improve the WebGL exporters greatly)...
Paintings - Živko Kondić (zhille.artstation.com)
Music- Miloš Nikolić (http://jovianaudio.com/who-we-are/)
Modelling Dejan Šaponja (shdejan.artstation.com) and myself