Castle Frenzy

In this game the player has to defend his castle from waves of enemies. He can do that by flicking away enemies with his finger, using traps and monsters he has bought against his foes, or casting various spells by using natural gestures (for example drawing a circle to spawn a rolling boulder, a jagged line to make a lightning bolt, or a V shape to summon a tornado). The emergent gameplay arises from the fact that all enemies interact with each other - for example, wild boars are enslaved by their masters and the player can free them, causing wild boar rampage in the enemy lines; sorcerers die in a light explosion that blinds other enemies, falling trolls can crush others with their weight, fire skeletons melt frozen enemies, etc. To recap, it's not a difficult game, but it tries to keep surprising the player with the interactions between the enemy units and the new spells and traps the player can unlock.