The last post is so outdated it hurts.
GRA is, at the moment, discontinued. It was a fun experience, and there's potential in the genre but the code base is, well, crap, to say the least and the only way to salvage it is to rewrite it from scratch. I moved to another project, Unending Galaxy, which, at the time of this post, is reaching 1.0.
If you want to know more about GRA and why it has been terminated, i'd suggest to read this post.
The game is still available in the download section. 0.6.7 is more stable, while 0.6.9 has more features.