Wow, I can tell you put a lot of effort into this, thanks a lot for the feedback! It looks like 1.5 will be a pretty big update! I have a long list of things to do now.
I think we agree that there needs to be some new abilities, and perhaps some of the current abilities should get some additional functionality, like a stagger on whirlwind and/or slash. E.g. more abilities that affect the movement ability of your enemies, because that is definitely the most important aspect.
It would be nice if melee guys didn't "have" to use magic abilities in order to win, though hybrid builds should still be viable.
Since a lot of the attack abilities are quite random, I've been hesitant to let the player destroy walls, but I'll think about it. There is probably a way to make that work. I like the dynamic of walls being a temporary blocker for enemies, but not a permanent one. It allows you a breather, but it's not going to let you carefully funnel in enemies until you win. I think that together with a lot of the other changes coming into 1.5, wall destruction can still work ;-)
Thanks again man, much appreciated feedback, as always!