This game is still in active development and available to the public for purchase in it's unfinished state, either in Early-Alpha or Beta (or any status in between).
SimpleRockets is back, but now it's fully 3D. Build rockets, airplanes, rovers, and anything you can think of with highly customizable parts. Explore 3D planets. Upload and share your crafts online. We're bringing it to Early Access while we work on a Planet Builder, Campaign Mode, and other key features.