You like tower defense game? If you also like sci-fi story line, the following universal game Sentinel 3 Homeworld may meet your taste.
Sentinel 3: Homeworld is a sci-fi themed tower defense game developed by Origin8 Technologies, and designed for both iPhone and iPad. Similar with most of tower defense games, in Sentinel 3 Homeworld, all you need to do is to prevent your basement from attack of enemies. The tower defense game features stunning graphics and nice sound, and comes with 20 levels full of challenges across 14 different maps, over 20 unlockable turrets and weapons, while the upgradable commander is also your powerful force. Apart from that, Sentinel 3 Homeworld also supports Retina display, OpenFeint and Game Center with achievements.
Sentinel 3 Homeworld with a size of 115 MB is compatible with iPhone, iPod touch and iPad running iOS 3.0 or later. At present, the price tag of the universal game is priced at $0.99 USD ( regular price is $2.99). If you’re interested, jump to App Store for more details, or check out the following demo video first.