I have beat the demo.
There's not much of it but I enjoyed what's actually here. Movement feels perfect, the environments look pretty good and are detailed and interactive. The key and lever were just integrated enough into the environment, I like the look of the big book and statue when in the hand, and the UI fits well enough with the environment. Combat works.
I'm not specially fan of having to use seamless turn-around to look for things.
This is promising, I'd play more.