Well, I loved to play the first one and right now I'm enjoying the the new features from the second one. Especially the innovative hero concept adds some interesting tactics to the game. You might have situations where the positioning of the hero is crucial for your victory.
The concept is very similar to wartune. Starting with an enormous amount of achievements, bonus, gold, fast leveling and "yeah-effects" it would get fatigable and frustrating after a while.
138, 1. Fault: I thought I can move like a knight on the chessboard. it seemes they have only the "rook solution". 2. I chose the apple, because I thought the numbers of calories... ^^
 "Kingdom Rush Frontiers"){kind=icon}
 "Idle Mine"){kind=icon}
 "Candle Man"){kind=icon}
 "SpiroStudio"){kind=icon}
 "Find The Candy"){kind=icon}
 "Undead Isle"){kind=icon}
 "Diggy"){kind=icon}
 "Knightmare Tower"){kind=icon}
 "Rise of Mythos"){kind=icon}
 "Cyber Chaser"){kind=icon}
 "How Smart Are You?"){kind=icon}
 "Zombotron 2: Time Machine"){kind=icon}
 "40xEscape"){kind=icon}
 "Soldier Diary"){kind=icon}
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 "Deeper Sleep"){kind=icon}
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 "Humanoid 47"){kind=icon}
 "GemCraft Labyrinth"){kind=icon}