What is the author's style in Outpost of Progress by Joseph Conrad?

The language in this piece is clearly 19th century, colonial European. Whether it is the narrator speaking, or the characters themselves, the use of words is at once critical, sarcastic and judgmental. There is no compassion here for either the native people or the European colonists. Rather, the language serves to inform one that impending disaster is about to befall not only these characters, but also the policy of colonial expansion itself.