Very... interesting, but it needs work. I'm sure that a game can be made of this, but the plot is kinda weird. I mean, if all the Islands get taken over, why exactly would the town be desserted? Unless the Villains have transported everyone to another place, it wouldn't make much sense, and there comes the fact that it's a little hard to believe that Alexander or Cassima could just come back to the Islands without Mordack/Alhazred and the rest finding out.
Also, there is another slight problem. You see, there were two ways to end King's Quest 6, one of them involved going to the underworld and saving Cassima's parents, the other one was just to enter the castle in disguise as a girl. And as you can tell, the endings are not the same.
Don't get me wrong though, I'm sure that your idea can turn out to good. But as I said before, it's going to need some more work
Till next time stay cool
