This was a very funny idea!
The 'fear meter', or whatever you'd call it, was a well-implemeted mechanic. It went down so fast that every time I was in a dark area I frantically moved to get out of it as quickly as possible. It very accurately simulated the feeling of being scared of the dark!
The music is very good, too. Simple, but fun and atmospheric.
Playing as a thief who's scared of the dark is a funny idea, and also adds an exciting extra edge to a stealth game. It would be good if this idea was expanded and turned into an even bigger game. I once played a stealth game about a thief that had similar pixelated graphics, called 'The Art of Stealth', so that sort of thing has happened!