What an interesting concept and so well executed too! I really like how you've done the package scanner. It made me feel like an actual detective inspecting criminal packages. Also the sounds of the man banging on the door scared the life out of me the first time - nice way to tie it into the horror theme!
If I was to make any suggestions for improvement, it would be good to have a mouse sensitivity slider. Also, the CRT effect on the monitor looked really cool but it made the text a little difficult to read. I'd maybe tone it back only a smidge.
But honestly, these are only minor improvements. Overall this is a such a unique and interesting take on the theme and very well executed. I love it, well done!