What are some alternatives?
When comparing Kingdom Rush and Tower Duel, you can also consider the following products
Fieldrunners - Fieldrunners is a game developed by Subatomic Studios, for Steam/PC, iPhone/iPod Touch, iPad...
Clash of Clans - Clash of Clans is a mobile strategy game set in a comically cartoon world of medieval siege warfare.
Bloons TD - It's time, once again to achieve total Bloon popping satisfaction, this time in the form of...
Robo Defense - Robo Defense is the ultimate portable tower defense experience.
Clash Royale - Clash Royale is one of the most popular mobile games on the market, and it comes from SuperCell, the same producer of other classics like Clash of Clans. Read more about Clash Royale.
TowerMadness - Tower Madness is an epic 3D tower defense game for iOS.