Hi,
I want to remember you some words from the Develop Team about the Tech Tree and the implementation of the Back Up system.
Technology Tree
Some players mentioned that if you don’t achieve certain advances you won’t be able to progress in the missions.
In our tests we have completed the entire campaign in Challenging with very different (and crazy) tree settings. We have even completed the campaign with only one unit: the soldier with all his improvements, without attack towers, and without any micromanaging, simply making hordes of soldiers and sending them to hunt. Also, using the Inn and its rewards without investigating any unit. And so many other situations and game styles just for fun.
In the end, what we want to say is that the fun comes from exploring and creating your own strategies with the resources at your disposal, to adapt and survive, that's what the game is all about. We hope you’ll agree.
Still, if you get stuck ...
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