You should try
Darkness Within: In Pursuit of Loath Nolder and
The Lost Crown: A Ghost Hunting Adventure. Very well done horror games, the former with a very "lovecraft" style and some pretty original mechanics, the later with a strong "Twilight Zone" vibe. If you like those you should also try
Dark Fall, also known as Dark Fall: The Journal. It is the first game from the guy who later would do The Lost Crown and some other things. This one is also supernatural horror/mystery, like the other two.
Since we are talking indie horror adventure games from the last two years you also have
Barrow Hill. Not as good as the three mentioned before, but still worth a check. And, while this one was made by different guys, Mr.Boakes, of Dark Fall and The Lost Crown fame, gave a hand with this one. I hope you are noticing a pattern here. By general rule you should get any Adventure Game that has his name somewhere in the credits.
[Edit: Dark Fall is actually the game that started the trend, among indie games, that spawned the current crop of games like Darkness Within and Scratches and Barrow Hill, and that showed a lovingly made adventure game by just one guy could be great. So it mostly single-handedly resurected Adventure Games. So if you liked Scratches you are most likely going to like those i mentioned on the first two paragraphs.]
I will also add a vote for
Realms of the Haunting. A well-researched supernatural horror game? One of a kind, i'll say, and if you have at least a passing interest in occult research you will have lots of fun finding references and influences. But there is not a lot of heavy duty adventuring in there, truth be said, and the end game is... trippy, to say the least.
And lastly, the better one of the lot:
Azrael's Tear, one of the better games ever made and the best game you have probably never heard of... Or would not have heard of if i were not singing hymns to it every other post. It has everything: Deep characters, good puzzles, a well made storyline, ghosts, mutant dinousaurs, crazy one-thousand years old templars, lots and lots of background lore, high-tech tomb robbers, one or two dead ends if you are not carefull, and a pretty awesome ending. Get it, play it, love it, and then we can go make a cult or something. If you get it without removing anything from an inventory get yourself the scaned manual too, since it has some background lore on the "dungeon", the Raptors, and you.
Evey time i end making one of those post i notice i should be bothering people in JA+ forums instead of the codex.