the game is missing the mortar style tower that is long range (longer than missile) and slow fires shells that do splash damage to large area (4-5 squares) with damage decreasing the further away from the blast an enemy is mortars typically would be aimed x squares ahead of the target but or at the target with the intentiom of hitting the enemies behind the target or should be able to choose attack area rather than enemies with upgrades to shell speed, accuracy, and splash size. damage should be massive but tower accuracy should be poor so that it hits randomly around targets.