Not by a long shot, no. Because it's not a space game yet. In fact, it's becoming less and less of a space game with every spur-of-the-moment chasing-the-latest-brainwave that comes out of Chris. And because whatever spacegame-like tendencies there are, they are pretty much universally broken, unfinished, or just plain bad ideas.
It is disqualified from being even remotely considered “the best space game” because not a single one of those words are even remotely applicable to the tech demo they've been trying to push out. Asteroids is — by very definition — a better space game than SC is.
They have been running in circles over fundamental components of a game, period — to say nothing of the space part — for the better half of a decade. Basic features are not only delayed, but outright missing in concept and design, never mind anything remotely resembling implementation. Some unnecessary guff has been given some kind of proof-of-concept treatment, only to stay there for longer than it would take to complete entire games.