Normally it is not necessary to hold the upgrades as most units in a specific upgrade branch has the same perks, but of course there are very interesting exceptions. I wish this game had at least one unique perk for each unit as to make the upgrade + perk selection a tad more interesting.
As for the FAQ I now think I am finished with it, if you do not have any ideas of what should be added. Maybe the stats for the end boss?
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