Really nice art!
Pretty difficult. Took me a while to get moving on the first level. Maybe that's just part of the point and click experience. Although maybe the clickable items could look a bit more special with their colors or something to draw attention better.
The player could move faster, although that might just be personal taste.
In the end I stopped at level 4. maybe I missed a clue, or I just didn't keep guessing the safe long enough.