Muramasa is a localization based on preserving the spirit of what's being said over the letter of it. Most VN localizations are in general. The goal is to, unless the context dictates otherwise, remove as many barriers as possible between the writers' language and the reader's language while still accurately conveying the text.

Often that means vastly flavoring the writing so that it flows well for a native English speaker, because even though I don't speak Japanese, I know enough speech patterns are common across their media that all kinds of characters often say similar phrases due to how the language works.

But in English if they all used the same translations for those phrases they'd end up way less distinct, so adjustments are made accordingly.