I hear ppl complaining about healers all the time, now that I have finished the game I just want to give them some advice.
Splash towers are not a good option!!!!
Mortars are bad at killing these guys!!!!
As soon as you splash a group of healers, they all start healing each other like crazy and things go bad.
Use towers that target individuals!
The best towers I have found so far for killing them are dragon towers and prime towers. They hit one guy and kill him, then start on the next guy. Don't try and kill everyone at once, this will not end well.
Good luck to anyone playing this game, it is fun but very grindy.
last badge is so hard!!! Requires matrix bullet dodge skillz. love this game so much, exciting and so many options, but never easy. Hate last last boss but that is what makes it interesting.