Next game: My ideas

[Hunter of Shadows]

Greater variety in enemies. Maybe the dogs fom Penumbra?

I think a larger variety would ruin the scares for people, because then you're spending more time wondering which monster it's gonna be rather then worrying about how scared you are

True. And the dog's from Penumbra aren't that scary at all. :\

A good theme for a possible another horror game would be with demons and spirits.

Well that would be because demon dogs are overdone to hell thanks to Silent Hill

demons and spirits you get with Clive Barker's Undying...I think anyway

The shadow is also in a way, a spirit, I know the game says otherwise at points, but that's just flavor text, it can be any way you spin it.

As for demons, the grunts and brutes are sorta demons. Eldritch entities from another plane of existence that possess humans and reshape their bodies.

But that's just my way of viewin it...