Played the demo. I am stunned. It looks beautiful! It makes you feel like you're at the beginning of the fall of Hadley's Hope. Didn't expect the demo had this much in it. Congratulations! I can't even imagine how the full game will look. Was surprised at the dialog choice options and how much it influenced the rest of the demo.
First time I went with the first dialog option, so I got to see the massacre in medical. But then the game started to have bugs and when I left medical, it locked me out, I couldn't get back in. I also couldn't find a way to get to Mr. Phillips' computer. Then it started to get difficult to walk through doors, I could only do it when I crouched. Then finally, my body somehow stretched and I became taller. I literally couldn't get through the doors anymore. I had been playing the demo for an hour by that point.
The second time, I knew the place better and I was much quicker. I chose the second dialog option and the game played out like in the video you posted.
Other good things about the demo, the dialog and voice acting was done well. The whole project, at least in the demo part, was done so well, it feels like I'm watching Aliens for the first time again. The sound effects and music were also great.
I understand that this is a fan project and you have a lot more content to make, but when you're done with that in the future, it would be great if you could optimize the game somehow a bit more, the lag and FPS drop does make it harder to enjoy the game. Though it runs better then I thought it would.
Overall, I'm very surprised at how good this is. A few weird bugs and lag are the only real problems I've seen in this demo. Keep up the good work!