I downloaded the demo and definitely felt like I was playing Trespasser. It took me a few minutes to realize that the door I was clicking on wasn't locked. I started having to swing the mouse in a wide arc to open doors. Unnecessary. It serves zero purpose.
I played the demo up until the invisible water monster. Really dug the atmosphere, wasn't so much into how much the camera wobbles around (I know it's part of the atmosphere, but it was making me dizzy), and just didn't like this part of the game. Jumping from crate to crate wasn't much fun.
Overall I think it's one of the best examples of a genre I'm just not overly huge into. Without having come across a reason to actually require the Trespasser-esque controls, it was enough to turn me away from the full version. I'd highly recommend it to anyone into this kind of game, though.