I just finished Culpa Innata and really enjoyed it! What makes it surprising to me is the fact that I couldn't get into it AT ALL at first. In fact, I started it 3 or 4 times before I finally got interested.
I thought the game was really well done. The only thing that was pretty distracting to me was the pattern of talking. I don't know if the voice actors were trying to speak the words as they saw them scroll on a screen or what, but it was kind of distracting to hear them pause mid-sentence, particularly after the word "that" and then continue on.
But I loved that there was a diary to fall back on when I didn't know what to do next. I usually have problems with non-linear games, wandering endlessly trying to figure out what to do next. But with the diary, I got "hints" as to what to do next.
All in all, a long, involved and interesting story, very well done.