I felt accomplished to have completed this game with 1805 clicks. It wasn't an easy mission to explore an underground derelict factory which involved occasional creepy scenes. At the same time, you had to take photographs of graffiti and tags made by a friend (what!).
Two chapters were particularly challenging because there was a time limit factor. You must have a clear mind and know where to click to get through.
Some pointers:
Ch 3 - Hold onto (not clicking) the crowbar when lifting up the locks of the huge gate underwater.
Ch 6 - Look for "4 x 3" clues in the nearby environment to access the computer info. All codes are different.
Ch 7 - Don't get distracted by the fly monster. There was a button to stop it.