Just finished Missing.
Highlights of awesome.
1. Lighting changes. Sunlight, then the warm glow of lamps and how that very same glow turns sinister in Day three.
2. A kind of "two-face" effect to characters. Not the game to be played at night in a dark room. (I left the lights on but that didn't help much.)
3. Briefing delayed until the game proper. No history lessons before you get to play. That's very good and refreshing.
4. The door opening during the second night scene. Now that I've seen this device, there's just no excuse if a later horror game doesn't rip it off in some way.
5. The road to the village and the text saying something to the effect of "I don't need to go there right now". Like mirrored walls in establishments, this has the effect of virtually expanding a game's play area and allows for the fact of being trapped inside the house to have an appropriate emotional impact.
6. The description for the basement key - FINAL DESTINATION, the feeling of impending doom.
7. Humorous comments. Given the mirthless nature of the plot, these serve as hints that Melvin is going off rails while actually lightening the atmosphere.
8. The phone line cut, I expected this would happen after I went pixel-hunting in the room, but I was too excited the first time I played to check. Sure enough, it's cut.
9. An appropriately slimy villain. I love Immortal Defense because the characters there are alien but sympathetic. I love Missing for quite the opposite: the villains are monsters who just look human.
I've had exactly two, both with pixel-hunting for something below ground. In the first instance, I had to consult the forums, in the second instance, I went mad and clicked all over the room, not really expecting a result.
I've had some trouble with the first lock, going all over the place looking for something that might be unlocked after I clicked on stuff in the correct order to no avail, then I realized the aristocrats would say "dexter" and "sinister" rather than left and right, and the problem was solved. The other code I've solved as soon as I read the hints - I knew exactly what info I need and how to get it...
...and now I have you, Orchard-L! Ha ha ha ha ha! They're British, they should have used British format!
But that's the only significant nitpick, which just goes to show how awesome this game is.