1. I'd say the gameplay was exciting for sure. It's impressive how scary the game could be. Great job on the ambience and character design. Just a great submission, well done!
2. I thought the map size felt a little big, only because I kept getting lost. I think it may be cool to include a handful of "You are here" style maps throughout the level to help orient the player. Even just have themed sections of the museum would help to build a mental map of the place.
3. The visibility was good. It was nice that you could still somewhat see in the darkness and sometimes you can see a silhouette walk by in the distance.
4. Again. I'm impressed with how scary the game ended up being. Sometimes the creature would catch me off guard and give me a jump, loved that!
5. As I said above, I could never get a good sense of direction in the museum. Most of the time, I felt like I was walking in circles and I just couldn't remember where I had previously found the fragments.
6. The difficulty feels a bit harsh. There were some runs where I died seemingly out of nowhere and others where I wasn't sure what I should have done to survive.
7. I'm not sure what's the benefit placing batteries on the slot. If it deters the creature than I'd suggest a buff, such as increasing the area of affect.