Unlockable Character may add some bonuses to the game, Fix the achievements page (is there really someone who have slashed 100.000 zomblings in a row ? or having a x100 combo multiplier ?), fix the combo-random-reset ( really annoying while having a x350 combo which became 0). But even with these little issues, i earned the Hard badge, with a x34 multiplier, 1 multiplier booster and 2 shadow cloaks. Really great game btw.
May i suggest you an option to rename the stuff that we wear or to create "stuff preset slot", kinda usefull if somebody want to quickly use 2 kind of competence ( for example, a set of stuff for the Dexterity, and another for Blacksmithing based on Luck and Will, or to change between ranged and melee fight)
 "Ninja Slash"){kind=icon}
 "Battle without End"){kind=icon}