Very cool atmosphere, and I would be interested to see where the story goes! The idea of individual bullet filled rooms that you have to make your way through is solid, but I ran into a few frustrations while playing. It was difficult to tell what was causing me damage a lot of the time, so I would definitely recommend adding more audio and visual feedback to show the player that they are getting hit. I was also quite unsure of where the hitboxes were, as there were times where it would look like I wasn't close to a bullet, but it seemed to hit me. But if you work on fixing these issues and build on the story and concept, you can have a great game on your hands!