I played only the full game and not the demo. As far as I heard about it, the demo had all elements of the full game just a smaller area to work in. If you think the demo was not fulfilling enough, I don't think the full game will satisfy you.

It definitely is a game where you need to set goals for yourself. It is better described as a program than a game, because it is not objective driven at all, but simply gives you the possibility to build scenes.