Ayy it wasn't a monster after all :)
I'll echo what's previously been said about the controls with the safe opening being quite difficult to use. I also think it would have been good to be able to exit a safe screen without putting in a combination, as sometimes I went to the safe without having a code yet.
I do love the cell-shaded look of this though, and your use of shadows to communicate clues was a really cool concept that I haven't really seen before - great job!