A crazy fun, amazingly compact game for running SF horror if you dont need a ton of fluff or want to pay for several pounds of books. A real old-school game with a super compact, modern zine design feel. if i wanted to play an Alien/Aliens game. This is the system I'd probably use, followed by (or perhaps melded with) Fate Accelerated. I liked this book so much that I bought a paper copy. One huge plus for Mothership is all the awesome stuff that has come out for it. A Pound of Flesh in particular stands out.
[5 of 5 Stars!]