First of all, the atmosphere is very good. You did a great job at that.
The sound effects seem to loop and refire, stacking over time which makes them very loud and very distorted. Not very pleasant for the ear, even for a horror setting. So at the start of the level the sounds were good, but by the end they were very annoying.
The second level also felt a bit like work. Walking around in this big level with nothing actually changing on your task was not very fun. It would have needed some form of gameplay change from the first to the second level, like you kind if indirectly did witht he third one.
Also it is very very dark, even with the flashlight, which even has a battery limit. You don't need it to be this dark to get the atmosphere that you were aiming for.
The noise filter over the image was a bit unpleasant for the eyes too. This also goes for the strong headbobbing. A lot of people can't play a game if it has something like this and it can't be turned off in the settings somewhere.
It still is a good game :3