Seems pretty simple, which can be a good and a bad thing.
Simple games are good in that players can easily understand the objective and play the game with little to no explanation. With our enormous Spanish and Dutch communities, less words=less translation=less confusion in games.
Simple games are bad in that these sorts of games get old quick. I could see this being a minor part in a much larger game, perhaps in a game where the player must complete several small objectives rather than one large one.
Anyways, it's a neat idea, but I feel it could use more.