early wave calls should be rewarded coins, giants sohuld give more coins and they can be killed harder, cannon is brekaing game balance, with spikes and cannons level is completed easily so evel hardness should tend to player using other elements of game.I like art and sound.Now its good game, if gameplay is improvedi it will better much.good luck
 "Siege Knight"){kind=icon}
 "Give Up"){kind=icon}
 "F.P.S."){kind=icon}
 "Fear Less!"){kind=icon}