Missile Command was one of my favorite games back in the day. It is now a well known classic and a game I would love to play again. GreyMatter Software has a graphically updated clone called Missile Storm which is available for a very reasonable $0.99 in the store. The game was previously available for the Storm but Barry pointed out to me that it now supports many other devices.
Missile Storm recreates the classic arcade game where you need to shoot down missiles before they reach your town/base. The hard levels are very difficult but not impossible. The game also lets you post your top score online to compare with your peers. The game is not available for all OS 5.0+ devices but most of them are covered.
Check out Missile Storm in the store at this link. Thx Barry for the tip!