Just finished Tenebra on my friend's computer. I thought the writing was a little bit weaker than WiH 1+2 and you could of done a better job explaining the new mechanics, but other than that I have no complaints. Every single mission was unique and very well-designed. In particular, One Future stands out as the best FreeSpace mission I've ever played--and this is coming from a guy who's played through Silent Threat Reborn, Derelict, Age of Aquarius, Procyon Insurgency, and several other excellent campaigns.
At this point, i'd be willing to pay as much as $60 for AoA and WiH (still glad they're free though!). Blue Planet has a better narrative than any other game I've played, including ones with good story-lines, and even manages to beat many novels (which almost invariably have better stories than games).
Seriously, amazing job. You've taken a decade-old game engine and created something at least as good as many modern AAA titles (if a lot shorter).

Side note: The conversation between Noemi and
Samuel Bei
seemed like a veiled attack on Christianity or perhaps organized religion in general.
Samuel looks upon the Vishnans as holy beings, calling them the embodiment of good (or something that basically means that) and refusing to judge them harshly when they abandon humanity to the Shivans. The obvious parallel would be the Christian God damning people to eternal torment that eclipses any of their sins by several orders of magnitude while claiming that he loves everybody and is good.
I apologize if that offends anybody, but that was the way I interpreted it.