It was fantastic!
Director Takashi Yamazaki explains how Godzilla Minus One / Minus Color is very different than the original film:
The original 1954 Godzilla is, of course, in black and white. But that in and of itself made us interested in what a Godzilla film would look like created with modern technology in black-and-white. But simply removing the color alone wouldnt evoke the same type of emotion we were trying to instill in audiences, which is why we went back to the colorist and we actually mask[ed] different portions of each shot and adjust the contrast by hand, as opposed to simply hitting the remove color button. [This process makes it look] like it was composed by a professional still photographer.
For us, removing the color in some way increases the reality, feeling almost like a documentary and making audiences feel that Godzilla actually exists. [This version of the film is] way scarier than Godzilla Minus One with color, even the team members working on it, wed get goosebumps
Because, in many ways, it does feel like a different film.
https://www.msn.com/en-us/movies/news/how-godzilla-minus-one-s-black-white-version-is-different-from-original-explained-by-director/ar-BB1gVGUQ