It's a nice concept and I could see it being a great game with enough polish, though at its current state I don't feel like the gameplay requires much thought at all, there are tons of ways to make it more involved, as I felt that the biggest problem the game has is that you can pretty much play on autopilot, never giving much thought to anything that is going around you.
But as I said it's a great base for a game that has a lot of potential.