And a better form of inventory management. Would be nice. The %50 attack penalty on sub zero is a bit over kill in my opinion I also wonder if Belittle and Subzero stack. Because a %75 penalty is really overkill. I know the game moves kind of fast and you're never really in a town for very long but a mini game here and there would be nice. I've also noticed to anyone who uses it. Using Decapitate is sometimes not as effective as just using Windmill or Reaper. Just a tip to anyone who hasn't noticed. But over all this is a really great game. Props man.
Game seems really slow to me. Combat takes to long. I suggest an option to let you turn off combat animations and just let you deal the damage. Or a speed up button.
I suggest adding multiple campaigns for the sequel. With different character skins for each one. Maybe a new class or two as well, perhaps a shop where you can buy new equipment for your units. Overall the game was great no real complaints other than it was too short.
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You may need to lower your graphical quality, it may make combat seem extra slow. It should be pretty quick when running smoothly :)