Some love in evolved, a flashback in retro, challange mode, and leaderboards make this way worth $5
The premiss of Missile Command is this. Missiles rain down on unsupecting cities, u fire bigger missiles, which make chain expolsions, which destroy the incoming fire. It seems basic, and it is, but in a good way. The Retro is just that, the classic blocky graphics which most oldie fans(like me) like better than the evolved.
What's wrong with evolved u ask? Nothing, but it is different. Instead of you firing missiles, u fire bolts of electricity, which work the same way as the missiles in retro. The graphics are nice, nothing mind-blowing, but u can call it evolved. The music and the sound a nice change of pace. The fans that played the classic during childhood will most likely stick with retro, but for newcomers, there is nothing wrong with the reinvention.
The achivements and leaderboards r nice, with a board for every difficulty (even "Throttle Monkey", think INSANELY HARD!!!) All in all, for a total of 400 microsoft points, you get a game that is addictive as GeoWars. But dont take my word for it, try out the trial for yourself.