Hey, this looks quite promising.
As for the problem... I agree with Unknown. For dumb enemies like the turtles, they could just walk around, more or less randomly changing the direction. Of course,the directions to turn to should be restricted to those lying diagonally in front of the turtle ( them suddenly turning around would be weird ).
A smarter enemy could walk around in the same way, but approach you when he gets close and then charge at you when he's even closer.
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