Out of curiosity, is there any chance for something like a Survival/Defense mode where you simply try to last as long as possible (or a set number of rounds) against increasingly more difficult enemies?
Asking because there's a bunch of well, towers meant for defense, units that buff defenses, and even spells. Particularly among the Frost Branch. And I'm not really into being on a set timer for the rPvE. Kind of gives me anxiety.