Why DE and Stanley Parable, too? Do them and STP with Scarlet Hollow all have psychological horror to them?
While stp definitely has elements of this genre, I don't think I can say the same about the other two... DE is sure psychological, but it's not very horror-y. It's more dreadful than scary. And Stanley Parable is very similar to stp in its setup "two characters who influence each other and change the environment around them" that creates good ground to analyse them. And, again, it's not very scary
If you need game recommendations, I'd recommend DE if you loved stp's voices, its existential themes, enjoy text-heavy games, and are ok with themes of addiction and violence. AND I'd recommend TSP if you liked stp's non-linearity, its sense of humour and annoyance of Mr The Narrator :>