Seems like it could use some balancing. Medic makes it way too easy to not die and Heavy was way too strong. He didn't have any spin-up time or anything else that would make him undesirable.
But even if it doesn't get rebalanced at all from its current state I'll definitely still download and play the **** out of it. Can't get enough of beat em ups.
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A hare like me couldn't catch up to Black Turtle.