Tech wise it's pretty weird. Input lag, long loads and low graphic quality even on PS4 Pro. Some effects look much poorer than I expected.
Fighting with the wrench isn't exactly satisfying, generally the only way you know an enemy around is the music changes. I didn't enjoy combat in this limited portion anyway.
The setting is still interesting but the opening hour doesn't sell it very well. I don't know, hopefully people with full playthroughs report an interesting story.
I suppose I shouldn't be so surprised it feels so much like Bioshock but it does. Not System Shock 2 mind you but Bioshock 1. It feels exactly like playing Bioshock 1 so far but without access to any crazy powers (yet I suppose).
Which isn't really what I wanted from this. We'll see from reviews I guess but I'm more tepid now than before I played the demo
Edit: The music is really weird, sometimes there's nothing happening and the music is just nuts. You're in an empty room but it acts like your fighting a demon horde in Doom. Worse though, there's little atmosphere outside the music. It makes exploration feel really dull. I was hoping for more of a tense mystery feel I guess but it's not there in the demo at least