I kind of got a reverse missile command feel from this which I think might be a very nice concept if you took it further might appeal very well to the arcade gamers.
This version was nice for a game jam, didn't know what to do at first because I thought the "Destroy the Geothermal Generator" instruction was the three towers shooting back and once I had destroyed all three I thought I had crashed the game or something but I got there and retried and managed it in 12 bombs.
Whats the best you have managed so far?