Level 6 could be possible if the AI didn't randomly get turret and range upgrade...
When it will be finally balanced, I expect it to be a easy level...
Enemies are dumb, most of the time, they hesitate, and get killed, and sometimes, they rush and survive, since they are healed when picking up a sheep, they'll make it easily back to the mothership...
Towers projectiles are too slow, when they mass rush, there is nothing you can do.
1/5
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