Just a suggestion on the warrior class, being Rage is one of the better abilities for all general purposes, I hate that I got to spend 5 points in whirlwind (which is useless vs single target pulls) just to get it. Maybe you can possibly put it in the same tree as cleave for those who truly want an AOE set
Game isn't bad in design, but many of the complaints I've already read I have, the last wave is silly, doesn't seem to help much what path you take, I've spread em out, clustered up, max upgraded, easy to get stuck on medium levels.
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