Im very interested in horror which relies entirely on situations and psychology with minimal application of "frightening" aesthetics. Visually, nothing here which is telling you to be afraid. In fact very likely the opposite. The discomfort you feel is a response to the nature of the reality you are experiencing.
Part of this is that I simply prefer naturalistic aesthetics, I like when things look functional and appealing. In my personal opinion, I also think a disconnect between the way something makes you feel and the way it looks is a powerful emotional tool. This is something I think about with Thrones, and Juggernauts, and Oracles (I'll get to them eventually) and so on. If you describe all of these things, they sound horrific or repellant, but visually there is nothing to them outwardly to tell you directly that this is something you should feel afraid of, disgusted by, or uncomfortable about. These things are clean and elegant, majestic, or even cute.
If Thrones looked like dark souls bosses, or Juggernauts really drove home how much I think you should be thinking of parasitic infection, I feel like some essential layer would be stripped from them. Appealing aesthetics are not there to mask or even soften the disquieting nature of these beings in the same way a screw worm fly is not shining blue and gold to hide or disract the fact it must obligatetly eat away the living flesh of an animal in order to continue its existence.
