This had great atmosphere to it. Are you planning to have music/ambient sound eventually or will you go with the silent/realistic approach?
I initially tried playing with a controller (wireless 360 for PC) and movement and reload worked fine but when I held the 'aim' button (left trigger) the screen shook for a fraction of a second and the aim cursor appeared before disappearing again. I had to switch to keyboard and mouse to continue. On that note when holding down the aim button (mouse) the screen jitters and shakes constantly until I release aim. Is this intentional/mood/story based or just a bug? All that being said the shooting was actually satisfying and I would love to play this game when it is finished. Just give more love and attention to stage layout and puzzles and you have a really great game in the making. Keep it up!