Anyone knows how long is the game? Or if there's more than one case, etc?

AFAIK there's only one case and game's duration is about 3-5 hours. But that's only what I've heard, I haven't played it yet.

One big case as well as a number of side-story mysteries.

I expect an average playthrough to be about twice the above number (which is still half of what I'd want, but them's the breaks), but it's the sort of game where completion time really depends on how much you explore and how good you are at it, so 3-5 (disappointingly enough, considering the price tag) certainly sounds a believable number.

Thanks guys.

I just finished it. It took me 5 hours.

I finished it in 4.3 hours according to Steam.

I'm on my 7th hour and I've only just got to the cemetary part so not sure how much more there is.
Also I found it interesting on the dev walkthrough they say they have not put in any artificial blocks but I have found lots and lots.

First thing I tried was go down to the water and see if I can go into the water....nope. So there is a block. I wanted to walk on the water line, rocks were flat, should easily be able to walk on them but nope...another block....

Windows I can't climb out of despite them being at ground level etc....

Anyway just a minor thing but I was hoping for almots being able to get anywhere bar of course thick shrub/bushland.

Amazing graphics mind you......I also noticed your character casts no shadow.

:) still enjoying it thoroughly, I find it amazing how people can finish it so fast.....

You should always take such promises with a pinch of salt. An open world tends to be a popular ambition among developers, but is very often restrained as soon as the gameplay gets in the way. This game just doesn’t make sense as an open-world concept, for one because it’s heavily if not exclusively story-driven (only a main plot), for another because exploration is not rewarding or even useful. There are no side plots or quests, no rewards, no characters you can interact with. Without restraints, the game would appear a lot emptier than it already is.

Four to five hours would be accurate if you’re familiar with this genre.

It took me about 4 hrs to finish this game. But i would like to add that the Replay-Value is considerably high, since it's really interesting to play this game again, having some background already!

While you might find it interesting to go back through again and I find nothing wrong with that, for the sake of others reading this, I do want to reiterate that it is a game where story is king and containing only a single ending meaning that, for most people, replay value will be nonexistent.

Finished it all. Took 12 hours :)

Played 6.6h according to steam. I found it to be quite enjoyable, an interesting experience.

Around five hours here. The puzzles weren't difficult at all. They weren't even really challenging. I found all of the puzzles on my first try, although there was some backtracking involved as I wanted to explore all of the forest paths.

The length is artificially extended with stupid crap like a certain doorway puzzle, so ymmv.