Just finished this game's main plot (assuming there is only one).
You did fantastic on making the world look and feel very scary, the silouette's of the cardboard cut-outs alongside the lighting of the game was a very smart idea! Everything looked and felt creepy. The game also controlled smoothly for a tank control game alongside the camera angles being very good to help that fact.
However, I didn't feel properly challenged in the game as whenever the Snipper would kill me, I would be brought back to a very recent checkpoint. Because of that I didn't feel AS scared when it involved the Snipper. Some mechanics of the chase I feel should be tweaked a bit too. I feel like it's very hard to not be killed by the Snipper when opening the door in the hall of scissors.
Overall, I would love to see what you make in the future! This game was very aesthetically and enviromentally creepy!