I have one suggestion: Maybe a little to late in the development, but it really bothers me :
When I bet my first Vicious Dungeon, I was really excited to find a vicious trophy that I can prep. You get one, but only INSTEAD of a locker item. With most of them being not THAT extrastrong, it felt kind of disappointing. I would love an extra building where all your vicious trophies are, that can be prepped aswell. Maybe make them twosided, so the balance doesnt get to wasted. But something that helps you defeat another vicious, because you beat the first one. This would be an awesome motivation in the lategame