I hear that the russian version is more complex, with the quantity of colors in the void affecting the void itself. I would like to play the game like that, but I only understand english and the english version is simplified. Is there a mod that accomplishes this?

I don't believe there are any gameplay differences between the English and Russian versions. Well, there's some really minor stuff, but nothing major anyway.

I'm pretty sure that Color affecting the void was not used in any version.

Yep, barkera is right about the 'color affecting the void' feature. There's a long post, somewhere around here, in which Halfgild Wynac talks about it. Suffice to say it was not implemented in either version (though it is mentioned in the help text for both!)

Actually, the original Russian release has quite a few differences to the later version. Halfgild gives a detailed breakdown here.

If you do seek out the Russian original, you can play it with English subtitles... Unfortunately, they're not synchronised with the game - But it is playable. Read this.

Really helpful and quick, thanks you both!