I would say that you definitely followed the idea of the theme. It was properly dark!
Things I liked:
- The atmosphere was sufficiently creepy. Even without any jump scares, I was getting freaked out.
- Firing the gun for light was a great mechanic.
- The small amount of light really added to the environment.
Some Notes:
- It was a bit too dark at times. It's a hard balance to find, but since ammo is limited, it makes you want to conserve ammo, and you end up choosing to wander in the dark.
- A camera flash may have worked better here. It would get rid of the ammo mechanic, which had a few bugs. The camera could also display what you just took a picture of, adding to the creepiness.
- I couldn't climb the stairs. I did see you mention that you need to teleport in the comments. I didn't know that was and option, so sorry for missing that.
Overall... creepy. You really nailed the theme of being afraid of the dark, because I did not want to go down the dark corridors that you made.
Thanks for a great entry!