Thanks for the well thought-out feedback! I can definitely see the appeal of this type of mode and I've been thinking about it a bit during design. The challenge is that a lot of the design of Circadian Dice is built around frequent upgrades/quick scaling and a very limited pool of dice. In order to make a true tower climb mode work one would have to (as you mention) either reduce the player scaling by a lot or redesign the scenarios completely. Either way would more or less amount to designing/balancing a new game on top of the old one :)
I really like this type of mode in deck building games so it would be fun to see something similar in a dice builder, but it's not in the cards (dice?) for CD right now at least. Your comment made me start thinking about it again, though, so who knows ... :)