Shadowverse

To put it simply: can you imagine a normal game in Russian made in such a style? I can't.

As already mentioned, Revamon CR. And CR is one of the few Russian games known outside the CIS. Stalker also has a lot of slang, as far as I know, and it's popular in the West (although the popularity of "Roadside Picnic" might have played a role here). And Metro 2033, as far as I know, also has some slang and is quite popular.