Nice strategy guide, i'll test this
My strategy is, spend the first boss' money on flood gates, and make great use of water turrets : with the upgrade, they deal 70dmg/s, costs 55$ for a fully upgraded tower, and sells well (90% of original price, 49$)
Then, upgrade the fire turrets, and build as much as possible!
I almost never use earth tower, except for the beginning, and never used ice turrets... They have no real advantages, only that an earth turret can hit 2 enemies at a time, which is useful at the beginning
The ice turrets misses an upgrade to make it really useful
B y the way, do enemies have weakness? I mean, red enemies could be fire elementals, and be harmed by an ice turrets more than a fire turret?