i like the idea of being placed in a small room and having to fend off zombies, but the execution is poorly made. You are currently unable to move, which i am not sure if is intended or not. There is also a chance that a zombie spawns too close to you, making it invincible and unable to be killed ( maybe it has to do with the hitbox of the bullet? ). A good addition would be to make the zombies spawn near the player, and not inside walls and boxes. In conclusion this game is a good idea, but not a polished game.