This is a nice little point & click: standard in many ways, but with rather interesting characters, occasionally entertaining dialogs and mostly enjoyable puzzles. The priest-detective concept (fine, ex-priest) is a novel enough idea in games, one I last enjoyed with the Shiva's rabbi. And sure, concpiracies centering around the Vatican are a dime a dozen, but the Italian background of the devs shows in the way they manage to be at the same time respectful and irrereverant, making a commonplace story feel refreshing. The story starts slowly but does a nice job of drawing you in, ending (predictably) with a cliffhanger, but one that made me interested in the episodes to come.
The writing mainly benefits from having small moments of actual brilliance in characterization, creating unexpectedly endearing portraits of both the hero and many the people you meet, that very much drive the storytelling. And since this is supposed to be the prologue in a 4 part series, there is alot of lovingly crafted character introduction to be had and enjoyed. In fact I have the feeling that it was the memorable characters (and therefore their story) and some decent pacing that caused me to mostly forget there were puzzles there. That, and the fact that they were mostly easy and logical, and that important information was always pointed out to you, more or less inobtrusively.
Some more general stuff: The backgrounds are nicely made, the animation a bit less so but not jarring. I enjoyed the music very much, though the voice acting can be hit and miss. I also had no bugs or technical problems, which I appreciated (since the first time I tried to play the DRM free version a while back I had serious issues - glad to see them fixed). And yes, the game is rather short, which personally doesn't bother me for the price.
All in all, I was surprised by this one, and will look forward to the next act. It isn't perfect or particularly unique, but it is memorable and endearing, and I very much had fun with it while it lasted.