Zigfrak Beta 7.0 was released last week - give it a try! Be sure to reset your saved game before venturing into the galaxy. Changes include new tutorial and high-end content, as well as bug fixes and technical improvements.
I'm trying to wrap up development for the first "real" release. If you have any thoughts or feedback, now is a really good time to let me know!
Downloads for OS X and Windows are available at Zigfrak.com
Thanks!