Very Hard
You made your game pretty hard. Almost every place you have to click is hard to find and without your walkthrough (thanks for that, btw) I couldn't have done it in under a week.
It took me quite some time to even figure out that you have to click on the border of an items frame to examine it. Before I read the walkthrough I thought you simply couldn't have a closer look by design.
The game gives puzzle-freaks quite a bit to chew on and although it might look very spartanic on the first glimse it's a complex game with many details. Best example might be the 'rubbish wall'.