I vote for
Sepulchre.
Here's what I think about this game:
Just finished this game, and I enjoyed it mostly because of the cool setting and ambiance. It kept me going until I knew what the hell was going on that train!
The mood is scary like twilight zone scary and the moving bag gave me the shivers.
Backgrounds art and character art are all high quality and the music was fitting for the genre and slow tempo of the game.
Voice work was a nice asset to the game, it's always cool to have them. I'd say they do the job well.
I could have had more story given to me but after playing it I didn't feel disappointed regarding that aspect.
There's a unsettling feeling along the game that kind of transported to "The Shining" movie and that is something hard to achieve with a minimalistic structure like Sepulchre. Bravo!
The puzzles weren't really puzzles in difficulty but simply a way to "hold" the player from completion and I think this was the only "weak" point of this game.
There are some easily fixed bugs as well that were already mentioned but nothing that really stopped my immersion on the plot.
My overall feeling of the game was pretty good and I wish it could have be longer. Although every minute of it is played with that good uncertainty and thrill. A good short game with high quality production that every one should play.