It's not a balance issue, it's closer to the skill issue. I can't say for sure, but you probably didn't learn how to use mechanics of this games, such as Tactical Advantages, elemental weaknesses and back-attacks.
What debuffs? Curses or passives that come from corruption? Most of curses could be avoided, and corruption... Serious stuff usually not earlier than second Mind Room.
It's good that you knoew all mentioned mechanics, it's a basis for this game. Could you describe more what is the main problem in your walkthrough?