Ah. Well... we've been having a bit of trouble deciding what to do about the demo. You see, we've got a demo but it's rather old - and it doesn't reflect the final quality of the game.
It's still available, feel free to grab a copy - http://www.adventuregamestudio.co.uk/site/games/game/1598/
Just be aware that we have made several improvements to what you see in this demo.