Thanks for playing, the sneaking mechanic doesn't do anything. My original plan was to incorporate footsteps sound and the guy will turn around towards you if you make too much noise. But it was too much of a hassle to program so I decided to scrap all of it.
I forgot to reset the state of the game once you complete the game and do a 2nd playthrough so all your inventory items are still there. I'm planning to fix this after the voting period is over.
Thanks again for the long and detailed comments.