The Japanese release of Galaga on the NES likely reflects the original arcade game most faithfully, although specific details may need to be confirmed. It's likely a direct port or a very close adaptation of the original game's design and gameplay.  The Japanese release might also offer insights into the original development process or design decisions that were later adapted or modified for other releases.

Galaga (Japan)

Galactic Crusader (USA) (Unl) (Bunch Games)