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