I liked this game a lot, especially the story told through the whiteboards, piercing together the lore and the message of the game. The 69/67 level notes also made me giggle.
The game design is a great take on the theme as well, counting bullets is such a cool way to make a countdown FPS! I loved it when the additional guns came in and it made the game harder in a really natural way, having to remember more numbers as they swap around, I thought that was really clever. And of course the perfect payoff in the final level where you can just blast, perfect ending, chef's kiss.
The level design worked well as a surreal landscape with the numbers scattered around, I thought. Did tie the whole number/countdown theme into it visually as well, which I think was another cool approach.
Very well done game, great job!