Great vibes, very "System Shock-y" which is what you where probably going for.
Scary Enemies, good mechanics, very intrigued to see what the full Game will be like and what kinds of things you will do with the sanity and the items. It's just a demo so not much to critique but the overall atmosphere and gameplay is very fun!
(it's easy to forget that the flashlight is on, when the power turned back on)