RE: Aliens/ The Seven Samurai.
It's very Night Of The Living Dead in that regard.
But the key element of The Seven Samurai is not the battle at the end but the quest to find the warriors which Aliens hasn't got.
Shame really because it could have worked as the structure for an Alien film (especially if there were plenty of prior films without Ripley).
That way she and the other previous protagonists could all 'assemble' for one last show down.