Gotta say, I think you have something here. I quite enjoyed everything in this demo. I think I explored most everything, and am not disappointed in the slightest. Very well done, I'll definitely keep my eyes on this project.
A couple things I'd like to say:
1. I was initially very put off by what seemed to be audio issues. Noises were coming from what seemed like the opposite of where they should, and it was really off putting, until I realized that the audio channels were dependent on where the character's ears were. If that was intentional, that was a really clever touch, well done.
2. This is kind of a rough complaint to write, because it could be completely intentional, in which case disregard this, but I think that dying was rather punishing at times. It completely killed the tension and my immersion to be sent back to the beginning of an area because of a slip up I made. I was kind of hoping for a little more leniency, like maybe a checkpoint after a lever gets flipped, or after picking up an item, but that's just me.
*Spoilers from here on out to anyone else who might be reading and hasn't played the game yet, you have been warned*
3. Small thing, but I noticed that if I was being chased, it was most likely going to result in my death, however I could avoid the enemy's attack by timing my jump. If intentional, I like this a lot. Makes chases seem like something that could be counter-acted and possibly something to escape from, or perhaps you can't escape from it, and it gives you the futile hope that you can, which I like from an atmosphere perspective.
4. I made it to the secret rave, which I expected to be a nice escape from the atmosphere and a reward for my exploration, but seeing the dead corpses littered across the ground with the stimulants and antidepressants, as well as reading the dialogue was crushing, but in a way that enhanced the game experience. It kind of denies the player of the happiness they want from finding a secret like a rave, and in a game like this, that's a great touch, and frankly amazing.
If you read this whole thing, thanks. I hope development for this game goes smooth as butter, and any other projects you may make as well.