Actually, I'm having this problem a lot. Many important items are extremely small and/or blend into the background. This could probably be fixed by including a Look option, which would point out items of interest if you get stuck, without resorting to a walkthrough.
The controls are awful. Trying to turn down a side path is almost impossible to do without bumping into a wall and being held up for a few precious moments. If you could lose lives, this game would be impossible to beat.
The final results screen after the Warehouse adds a day to your total time. Also, even if you finish in 12 days (which I believe is the minimum, since I completed each case in one try), the message at the end still says "See if you can do better next time."
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