I have the feeling it might have been a mage.
Still, I can't really say for sure.
To make the planning section easier to understand, I would however suggest the use of different colours to represent different units / different levels of units / squares targeted by more units.
Honestly, shades on red on top of other shades of red felt a tad overwhelming and I ended up relying mostly on instinct.
Also, as Melee Units felt the most dangerous, I would suggest something like a small white border around their range to make planning around them more explicit.
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On the topic of showing every attacked tile at once, I am in disagreement.
Honestly, despite the issues I had with red on top of red, I felt like moving the mouse across the tiles looking for the best path was not bad.
I believe having the opportunity to already know every turret's range with just a click would probably feel less rewarding than moving the mouse across the tiles.