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The enemies themselves increase in difficulty too, and you'll soon need to make very quick use of the muster button that draws all troops together, so that you can lay a frantically spammed area-of-effect heal over everyone, and whenever the cooldown for it expires.
That change of pace, and the difficulty spike overall, is a little too harsh to be honest and is one area where the game lets itself down.
The initial hand-holding tutorial levels, which seem a little too over-simplified, would instead make a more welcome appearance later on, when advice is needed on dealing with specific threats.
