There’s also a free build you can download at itch.io.
The beta build should be very stable, playable, and (I think) fun. It’s a completely unrestricted version of the game that represents the current state of development. Since the last news update we’ve added a lot of new features, including improved space combat and diplomacy, along with the addition of the spying system. If you’re unsure whether you want to back, I suggest giving the beta build a try.