Best thing about Firefly was it's awesomely idiosyncratic Whedonese - something the author has captured nicely in this game. If you're a fan, there's enough here to remind you why you liked the characters and the show.
Pinched is really short, though. And while a linear storyline isn't necessarily the wrong thing for something like this, Pinched is really, really linear.
Still, Pinched is fun and worth a look. It seems kinda like an experiment to see if the author could get the feel of the characters and show to work as IF. If so, I think it pretty much worked. Perhaps it'll lead to something with a little more exploration, character interaction and slightly more thrilling heroics.
In the meantime, my days of not taking Firefly fanfic seriously are definitely coming to a middle.