There is a small possibility you have played this game called Crystal Guardians. There is also a small possibility you have played a game called Tower Defense. So let me explain to you these wonderful games.
Tower Defense games are pretty fun. I started playing them in Warcraft 3. The objective of a tower defense game to stop all creeps (enemies) in a level using towers(normally with special abilities) to attack the creeps. The Creeps follow a set path in a map and attempt to get to the end of the map and steal one of your lives. Tower Defense games are all over the Internet, go into google and type tower defense and you will find one. All vary in difficulty, you have been warned.
Crystal Guardians is a tower defense game that using characters from Final Fantasy Tactics. Three episodes have already been released in Japan, but none have reach state side. The games have a possibility of reaching the states in the form of Crystal Defenders, and it will include all 300 plus levels from all three episodes.
Since the Ipod touch and Iphone are doing so great, why not release a game like this for the apple store. There are a few problems I have if the game does in fact get released over here. How do you control a tower defense game with the touch screen? How much battery will it suck out of the Iphone and Itouch?