Saw your in-depth review for the Lonly Wall game and had to check you out! Good execution for the only one tower idea. Well done. I think "tall > wide" in games where I have the choice and you just provided the edge case for a "tall" only game :)
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yeah. its a term used in strategy games.
lets say you have the option to place 16 cities in a strategy game like Civilization for example. that would be called playing "wide".
if you would only place 4 cities but those are a lot bigger than the cities the "wide" player placed, thats called "tall".
same for tower defense games. do you place hundred lv. 1 towers or do you place a few high level towers? and your game is "tall" by definition because you only have one tower :)