author, that story synopsis is sexy as hell and i can't wait to learn more of the characters and plot when the demo comes out!
a question (that you don't have to answer in detail in case it falls under spoiler territory): what do faes look like in this story? do they have more human features or have an appearance of their own?
Fortunately for you, this doesn't really fall under a spoiler territory. In The Echtra, the Fae (or Aes Sídhe, as they may be called in-game) that are the main players are descended from the Tuatha de Danann who once ruled in our world, but were relegated to the Otherworld after their defeat at the hands of the Milesians (modern day people). Because of this, they resemble humans—to a degree. I'll use Idris and Séaghdha as examples because they'll be the most recurring in game.
Both of them resemble a human appearance, but only to a certain extent. Séaghdha, for example, has some features that designate their status as a Hawk-Fae; as mentioned on their character page, they have feathering on their neck and at the edges of their face as well as wings that they often cover with glamour. Their eyes, as well, are hawk-like in appearance, and their nails can be perceived as claw-like.
Brief interjection—another point I want to bring up is that Fae like Séaghdha often use glamour to alter or hide their appearance in the presence of those not from the Otherworld (MC). Some Fae don't do this, though, and will appear as they are before any humans. An example of this is Idris.
Idris also looks human, but has some features that are not human and fit with his status as an Unseelie member and what he is as a Fae (which is spoiler territory). As mentioned in his character page, Idris has dark markings like tattoos on his skin, dark sclera, horns that resemble an addax, and serpent-like eyes. Idris is a Fae who doesn't use glamour to disguise his appearance, so what you see is essentially what you get.
Both Idris and Séaghdha have the sharp teeth typical to the Fae.
On the flip side, other species that reside in the Fae Courts (Boggarts, Bogles, Lubber Fiends, Bean Sidhe, Oilliphéist, Puca, etc) don't look anything like humans, mostly because they aren't descended from the Tuatha de Danann (with the exception of Bean Sidhe who can appear quite human at times).
So, depends on the type of Fae, and they aren't entirely human-like.