why all qsp games are russian?
It was made by the Russians circa late 2000's.
It does not take much knowledge of programming languages, just a tit-bit of HTML and a good read of the documentation (its in Russian), which makes it
user-friendly and
very easy to use.
All in all, as it doesn't take that much effort to create a working game, people will use it. I guess that Russian guys tend to put out more of their work.