Very neat meta stuff here and a thoroughly surreal experience. The tank controls are a little weird, but I guess its kind of reminiscent of Res evil games so not so much issues with that.
Weirdly, the shader bokeh effects I feel are a little overused. If I do full screen mode I can't read the blurry text which is weird, so I have to play it on a small window which breaks some of that immersion. I think pickups were not very clearly communicated as well as I had spammed spacebar and picked up objects unintentionally, and couldn't understand that having a key icon appear means that you had picked up a key, until much later in the game. Guess that's why you need QA guy though? The UI in the email client was on the other hand neat, understandable and easy to follow without getting lost, so nice work on that. Good job!