I've fixed most of those bugs (except the one unkillable Naruto character, That's a mystery as of now). Enemies are meant to stop in front of Waifus because they're distracted - hence why Waifus are decoys. To keep enemies from the door. But they're meant to be temporary so that they're not abused or game breaking.
As for turrets being OP I'm adding more enemies and a new type of enemy to shake things up. Expect an update in a few hours and thank you so much for playing!