Love the idea and the execution. It was surprisingly fun to just be sneaking around and taking stuff. I love the small ambient noises/music.
I didn't feel any urgency or, honestly, difficulty. It never felt like I was at risk of failure. Also, playing on keyboard + mouse, the mouse kept escaping the game bounds while I was trying to look around. That may not be anything done wrong on your part but it was a little annoying.
Great, great, great submission!