The thing that ruined this game for me was, just like the 3rd game, extremely badly implemented 3D. WHY did this beautiful gorgeous hand-drawn gem of a point and click fall into disgusting looking 3D mush....??? The graphics actually make the game look older then the original games imho. Forget the story of the game, the gameplay, control and graphics are terrible.
The story is fun and the puzzles are still challenging like the first two (amazing!) games. But the 3D and new controls killed this game for me. I do NOT agree with people who claim that the transition to 3D was successful. I was seriously let down when I saw the gorgeous jaw-dropping first two games were changed to a 3D rip off. Sure the game, story and gameplay-wise, is still a high standard, but if you don't like the style like me, I think you will be at least a bit disappointed. Be warned.