Nice idea. Should have a very short tutorial at start of first game. "Draw a line here" or something like that, and after player has drawn the line, then drop the man on that line and start game. Or instead of start game button, require a "Draw line here to start game" action.
Fun idea, but needs work with tweaking difficulty right. At least levels beside last are too easy to walk through. Getting upgrade points is a bit too tough, since you can't go back and play earlier battles to improve their points.
If I send an engineer to advance towards a target, and then lay a mine field while still walking, he should not continue to walk on top of a mine he just laid down.
When you have an enemy coming from rear and both mage and swordsman, why is the low armot mage always charging towards the enemy, and close combat swordsman not? Poor henchman tactics.
Xenophobia says your summon cards have no effect. But when I got it, my already summoned creature on board was removed as well. That should not happen.
 "Fantastic Contraption"){kind=icon}
 "Make Happy Umbrella Man"){kind=icon}
 "Bowling Alley"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}
 "Warfare: 1917"){kind=icon}
 "Talesworth Arena: Death Watch"){kind=icon}
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 "Straw Hat Samurai"){kind=icon}
 "Ether War"){kind=icon}
 "Swords and Sandals Crusader"){kind=icon}
 "Mud and Blood 2"){kind=icon}
 "Pixelshocks' Tower Defence II"){kind=icon}
 "Warlords: Heroes"){kind=icon}
 "The Necronomicon"){kind=icon}
 "Dog Eat Dog"){kind=icon}