How about having the series into a book?

[Thaliur]

I agree that the story is great. But to make books from it, a lot is still missing.

Penumbra Overture offers about eight hours of gameplay.
As a book that would probably amount to maybe fifty pages, if read in one go, but most of the gameplay time consists of sneaking and similar.
And one thing that would make it particularly difficult for a book author is the lack of characters. We just have Philip and Red, and they never really talk to each other. Not exactly the best condictions for a book.
A movie might work though, I guess.