First post in a while, just wanted to congratulate the BP crew on the release and offer my praise for act 3. While I can understand why many found the new gameplay elements jarring with how they were introduced, I didn't find them too difficult to get the hang of with reasonable speed. Granted, there were a few restarts here and there, but nothing annoying. Her Finest Hour in particular was excellent, in my opinion.
On top of that, I'd like to acknowledge that I really like the effort you guys have put into making the aliens of BP as, well, alien as possible. Too many people that I know are obsessed with clean, easily understandable origin stories and motives for the Shivans. I prefer them being treated as monolithic and beyond our ken (hurr) for once. At the same time, I like they it wasn't simply stated "You will never understand these beings." Too many authors will simply borrow a page from Lovecraft and slap this element on their alien hellbeasts and assume it makes them scary. An alien that is actually made to be inscrutable and has visible evidence to back this up, as opposed to us being informed that it is, is infinitely more menacing.
The only real criticisms that I can offer are to simply dial back on the in-combat dialog a bit. This was an issue I'd mentioned I had with the first WiH release, and it applies here as well. When conversations are occurring while I'm desperately trying to dodge Auroras after blowing something up, it becomes rather hard to divert attention to the top of the screen to ensure I don't miss lines.
So there. I consider Tenebra an excellent release, and you have my rapt attention with the story. I look forward to seeing where you take it and how things will end for Laporte. And the Gefs still remind me of Third-World Ousters.