Oh wow, the intro exposition scene is amazing! The visuals and mood were extremely strong. I was sucked in instantly. I also really like the puzzle mechanic.
The first room was a perfect amount of starting difficulty. The hallway after that was quite a difficulty jump. Honestly this game is really impressive. One thing though - it was hard to make the dialog go away. I would read it, then click, and it wouldn't go away until I waited for a few seconds and then clicked. I read faster than the game gave me credit for!
Please upload in .zip format in the future. Many users won't have a .7z unzipper installed. Also it complains that UnityPlayer.dll isn't found. I happen to be a Unity dev so I know what files it needs, I copied them from one of my builds into a folder and I could run it. I don't think many people will go through this effort so sadly you may not get many reviews.