That's a bit of a leftover really, I meant to replace it with trophies/achievements, but haven't found the time yet (the trophy icons are already in the sprite sheet IIRC, just not used)
That's by design actually, all towers have a turn rate, so you all placements "in range" are not equivalent in terms of aiming and rate of fire. :-)like continually turning clockwise to track an enemy that's moving clockwise across the field of fire (around a curve) without ever actually pointing at it enough to fire.
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