i played so many times this map testing element combinations, and i think that you should give a boost to the damage, Range or AoE of Earth, Water and Fire Towers or .. maybe up the Range .. but if we compare Light Tower and Earth tower ....
Light tower does 7500 damage * 0.66 speed and no AoE "splash" and range 22
Earth tower does 3750 Damage * 1 Speed and AoE "2.25 100% - 4.5 50%" and range 10
Fire tower does 1875 Damage * 0.33 Speed and AoE "1.5 100% - 3 50%" and range 8
even with the AoE, the performance and the kill Rate of the Light tower and the Darkness tower are too hight compared with Earth's and Water's Towers. especially if we talk about Element's bosses.
what do you think ??
ohh i forgot ... Im talking about SC2 version