I'm now playing version 0.81a.011 (I don't know the exact beta, maybe 5). The game has still bugs (so annoying you cannot upgrade your ships in the shipyard screen), but what is really disturbing, alas, is the economic mechanism, that is far from clear to me. Particularly I wonder if is there a proportion between the class of a planet and its maximum population, just not to waste time and square building farming facilities useless.