That's rather interesting to hear, I will try again later and see what happens, already used my energy on campaign hard mode bosses.
This is why I use 3 ranged units and 1 melee/tank so I have less to deal with, but it still has its annoying moments since Eli, my melee, is slow as hell and the other 3 always run pass her if there are no mobs and enemies with large AoE attacks are just annoying to deal with in general, like I see a lot of Luna enemies in the campaign mode and let's not forget bosses with magic circle AoE skills that will one shot anything that isn't a tank.
Honestly, since the actual launch of the game, it's been more gltichy and buggy for me than it was during the beta, like sometimes I can't even pick up the girls, sometimes skills don't activate despite me placing them in range unless I try multiple times and sometimes girls and skills get stuck on my cursor even though I'm not holding them down.