Interesting as an inversion of the tower defense concept, infinity_clover suggests that there should be more variety between rounds, and more varieties of types of towers, as that gives more to think about in deciding the order.
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Thanks for the feedback! Fully agree, the strategic depth isn't as much as I'd have liked, but as always I ran out of time :)
One idea I also had is that sacrificed towers would still have some sort of effect, e.g. slow down enemies for a round or lay some mines. That would add the choice of "benefit now" vs. "long-term defense".