Couldn't be any better
Lovely game you made there. Especially the scoring system gives the game a long term value, since you can always improve...
i really like the puzzle style of the single levels and the whole atmosphere of the game. especially how the night gets darker and the weather changes.
However, how about implementing something like a time trial mode? After i managed to complete the game without dying or being seen, i tried to beat it as fast as possible, which was IMO more challenging and more fun...(time --> 112)
Oh yeah, and how about a button to turn the sound off, not that its bad or anything, but some people (like me) want to hear their own music on the computer while playing.
Cheers!