Wouldn't really recommend any of the Mutant Chronicles standalones except for Siege of the Citadel. Even then, that particular game is extremely basic. It was great for its time. While it's not scifi, Claustrophobia is kind of on equal difficulty and style, but with more decision making options. Siege is up to five players, though, compared to strictly two. Otherwise a simple retheme would serve very well.
But Blood Berets and Fury of the Clansmen are both similar to Space Crusade in that they were VERY simple and hardly worth the effort to acquire. Unless you're a Mutant Chronicles universe nut.