If you play 1, 2 then 3 you can definitely see the change in graphics.
I agree with Brumz, the game seems more focused on fun instead of puzzling, unlike 1 and 2.
Awesome game! The end made me ROFL, literally. All in all, I say 10/10 game. On the 'You can drag them' one though, you could try to make a barrier so they can't take the drag-blocks off the screen. I know, nobody would do that unless they're really stupid but... :P