What are some alternatives?
When comparing Kingdom Rush and Bloons TD, you can also consider the following products
Fieldrunners - Fieldrunners is a game developed by Subatomic Studios, for Steam/PC, iPhone/iPod Touch, iPad...
Tower Duel - Tower Duel is a Multiplayer Tower Defense Game for iOS and Android.
TowerMadness - Tower Madness is an epic 3D tower defense game for iOS.
Clash of Clans - Clash of Clans is a mobile strategy game set in a comically cartoon world of medieval siege warfare.
Bejeweled Blitz - Our games are sprinkled with a whirlwind of smile-inducing awesomeness and polished to a shiny sheen that keeps the world coming back again and again.
Robo Defense - Robo Defense is the ultimate portable tower defense experience.