From the fact that the movement is slow and choppy and the whole limited movement in the first place to the whole not even being able to have an inspect option on the numerous uninteractable important looking things and the poorly placed interaction points (the middle of a set of scales rather than the weight part? Seriously?) This game is a letdown in every aspect.
I'm sure some will try arguing "hey this game is ten plus years old" Guess what so are fable and postal 2, Planescape: Torment is even older and all thos games have much more complex interaction systems and more stuff actually using memory so arguing the age of the game is pointless since it could have been done much better even then.
I would argue it would have come across a lot better being made more in the style of monkey island 1 which was a lot smoother a lot older and a hell of a lot more fun to play, Crash Time II is more worthy of time and money and you've seen what people have said about it (actually the failiures of that game are actually funny and the gameplay is fun to screw around with for long enough to justify buying it).
If you're after good point and click adventure games on steam check out the catalog of games Daedalic Entertainment have, literally ever one of them is entertaining and worth putting the money towards if you can afford to.