I really enjoyed this demo!
The mechanic is very solid and I can see it being used to great potential, the cut scenes were well acted (I think, I don't speak Spanish), one thing I was really impressed by was how smooth and good looking the hand animations were when the character examines something.
So all in all a very good demo, I would be interested to see where you take it.
(also, I found the Silent Hill 2 nod when examining guitar, if there's one song to be influenced by, that's a damn good one!)
Here's my video for anyone interested: