I'm not sure Ultimate Defense really has any use currently. With so much of the game's focus being on defeating the waves of enemies, damage output is always going to be more valuable than tankiness. Especially since it's less an issue about the player-character getting defeated from enemy damage, and more an issue with enemies making it through the entire path.
So I would propose that Ultimate Defense be tweaked to either grant Lives (either a flat rate per activation or a regeneration), or to instantly revive the player if they are defeated (refunding and/or restoring any Lives lost from that defeat).
Maybe it's just an issue with my playstyle, but I can't imagine Ultimate Defense being more useful than Overwhelming Fury as they currently stand.
Sup, Kristin!
Absolutely, once you get high tier items, you can tank enemies easily. Something that would take me time playing to balance and adjust the right progression.
That´s why I gave damage bonus to ultimate defense, to still be useful. I usually test all skills, and the magic resist is quite usefull early-mid. But late game it falls off a bit.
I´ll consider your suggestions when I create a new tab for upgrading towers. Each tower will have a skill tree, and additionally I´ll include some global upgrades like the lives and revive mechanics.
Currently working on a new level and item augmentation system, if everything goes well it will be up this weekend.