Oh boy, you're lucky I just finished Outlast and Amnesia not too long ago. I got to the second floor but didn't finish after. I couldn't turn the flashlight on. Is there a button for it? I was just riding the walls to get around when the lights went out.
Could probably use some more polish with wall decorations in the long hallway. Maybe they could be extra cleanup tasks. The barrel "maze" on the first floor was also a bit repetitive. Maybe try varying up the placement.