It's cool that you made something a little different from your usual games. To echo the other commentators: combining LEGO and point-and-click was a great idea.
However, you might want to make the scene transition arrows a little more noticeable; I had a hard time noticing the one that leads to the safe/cage with the red gem in it. It also feels a bit empty without "I would've gotten away with it too, if not for you meddling kids!" Heh. Jokes aside, the rest of the game flowed well and made sense.