Here's an odd idea for a game I came up with...
There's been a huge explosion up in space, and bits of asteroids and stuff are raining down onto your planet in waves. You must man a gun, made up of 5 cylinders that shoot rockets, to destroy these chunks of rock by 1)Choosing which to fire and then 2)Flicking the fire switch. Sometimes there are chunks falling on the same line, so you must fire two rockets at once. Sometimes rocks are close by, so you can chain explosions together. If you miss rocks, they fall down and hit the cities. A "Rock" meter on the side that tells you how much more the city can take. Also, the gun has a specific range, so you must fire when the chunks are at an exact range.
I'd call it Global Help: Legend of Rock, or GH:LoR for short.