The Return To Mysterious Island Demo is a different kind adventure game.
I am sure most people have played Sam & Max with their wild item combinations, but with Return To Mysterious Island, item combinations are taken to the next level. Really you have to play it to see what I mean, but the level (in the demo at least) is filled with stuff to collect, and in their raw state the item you collect are of no use to you, but when you combine them, you can make a fire, a knife, a lighter and a few other things that help you on your way.
I don't know if it is worth buying, but it's certainly interesting.