The creature is a giant spider with tentacles pedipalps and tarsal claws like fingers. I kinda of like its design, but then I also like arachnids and tentacles. XD
Also I think it has a human-ish mouth but it's dark and hard to see, but it's definitely in a different spot and is shown moving as the creature speaks.
Okay two things: I have been emotionally compromised. Which is kinda the point of this movie. It's a slow drama which I am surprised to have watched all in one go.