Really nice demo. A few notes:
The white UI elements (back arrow, and sometimes even the cursor) can be invisible in the high-brightness backgrounds sometimes.
While I approve of the webcam idea in theory, it's hard to ethically pull off. Unless you tell a player up front that their camera may activate, it really isn't the right thing to do. You don't know who else may be in the room or what the camera may catch. I know it isn't transmitted but it's the difference between talking to someone on the phone and putting a bug in their house. And if you tell the player up front you will certainly miss out on the surprise of the reveal. I'm just not sure the needle can be threaded.
Great first pass, hope someday it comes together!