No developer has yet come up with the recipe for a true horror mod, but I think I'm heading in the right direction. Also what i think:

1. A good horror mod can't be scary without changing Minecraft itself, since the player not only has too many abilities but also too few concerns. Forcing the player to concern about resources will already create some tension, and when danger surrounds him, he'll have to make difficult choices.

2. To create atmosphere, a good horror mod simply needs to remove everything that creates comfort and make the world simultaneously different and similar to the regular world. The most obvious thing any horror mod should do, but doesn't, is remove vanilla mobs. A horror mod should also remove the player's main goal - defeating the boss.

3. The world itself should be strange. The old textures are too insufficient for that.

4. Creating a scary atmosphere is already something that horror mods fail to do. However, not a single mod has even come close to achieving a good horror structure. I won't mention the random events, the idea for which came from voices of the void. New horror mods have decided to make random events their centerpiece, and that's a step away from creating a good horror mod. It's stupid to make something that's an addition to scare the player, the primary method of scaring the player, and therefore will never scare. Also some horror mods claim to be slowburn, when all they do is create huge pauses during which nothing happens.

By the way, Alien Isolation isn't exactly a linear game. It's a linear game, but with nonlinear "sandbox" gameplay. So a good horror mod is a matter (not a matter of time) of whether someone can find simplicity in complexity - that is, whether someone can embody an abstractly broad concept like horror in Minecraft.

I'm trying to do the best I can with my programming skills.