I actually just wrote another game designer an email on this exact subject.... odd coincidence.
I had seen Albedo in comic book stores but never really took an interest until I played Platinum Catalyst at a convention back in 2013. I've loved it ever since but couldn't articulate my thoughts until I really sat down and thought about it.
I think the overall appeal of Albedo is that it's a science-fiction setting that doesn't put its setting before the characters, and makes sure those characters are realistic. I like comparing it to Firefly because they take similar approaches to sci-fi. Both are clearly in sci-fi settings but keep those settings realistic, and never let the setting have so many elements that they overshadow the characters. The setting is inferred rather than explicit, and only exists as a vehicle for the characters to interact. History only extends far back enough to give the characters appropriate context (and in Albedo's case, history literally begins no further back than that) and the reader is left to focus on the characters and muse over the environment later.
The characters in Albedo are unlike humans in so many ways, and behave in ways that humans don't, and yet their behaviors and routines make perfect sense in the culture they occupy. They're naive in a number of ways. Religion is nonexistent, philosophy is dedicated solely to speculating the nature of the universe and the species therein. Art and music are new concepts to them.They have vast levels of scientific knowledge but find themselves stuck with very simple problems. Their methods of warfare are foreign to us and lack our level of sophistication, yet they are perfectly suited to the situations they find themselves in. They have no prior history to draw upon for inspiration or teaching; everything they do must by definition be new. In many ways, they are extremely human characters, but simply humans without baggage, starting completely from scratch.
Albedo could have been just another sci-fi world with animals-as-people, weird terminology, rule-of-cool science, lasers everywhere, and outlandish cultures that couldn't possibly sustain themselves if logic were applied for more than sixty seconds. Instead it's a down-to-earth military story about characters trying to solve very real problems of competing interests and ideologies in a universe on the brink of war.
Also, killer rabbits. Seriously, it's not easy to make a rabbit scary, and Albedo has a galaxy full of them. Hats off to Gallacci.