This game is tedious rather than sneaky. As others have pointed out, this game requires a LOT of pixel hunting, and gives vague clues on how to solve most of the puzzles. This causes the game to become less of a fun, interactive experience and more of a tedious search through each item to find any hidden corners or clues. Adding more direct clues for each puzzle and making it slightly easier to tell whether or not something has more than one function.
Overall, tedious, but it can be worked on.