doing a Lost video game isn't like doing a 24 video game where you can have a self-contained video game plot. Either the plot of the video game would veer off from the plot of the show, and people would complain that it's too different, or it would coincide with the plot of the show, and people would complain about plot points being spoiled. Or, they could just invent characters to be on the island, but people would complain that you were just controlling some no-name crash survivor. Once you get past "Hey, they're making a Lost video game" it doesn't sound like too good of an idea.