It is still the Alpha version, however. I am not in the dev. team and I don't make money out of US, so don't take this as an ad. I just thought this would be of interest to some.
What bothers me a little is that they said that if you own US1, it would automatically update to the next version, but then they changed their minds and I will have to buy this one :/
www.universesandbox.com/2/