So many great ideas, thank you!
The favorite minion and theme build stuff will should be addressed when we introduce starting clan selection. Not exactly sure how it will work, but will help you build themed decks more easily. We also may add the ability to influence which clan the store has for sale.
I'm changing the reroll button so it resets every floor, since I don't think anyone uses it now.
Resistances are planned too. We'll be adding fire and ice abilities to defenders and some minions will have resistances.
Toying with various ideas around equipment. I'm considering giving minions equipment slots and you'll be able to pick up equipment and reassign it between waves.
The encampment and kennel idea is a cool one, I think we'll be doing this sort of thing with collectible relics that help with bonus synergies, but I'll keep your idea in mind as well.
Thanks for playing and for the great feedback!