The barrels go beyond unbalanced. Collecting every oil, smokepowder, and firewine barrel I came across in this slice of the game (about 30) after learning about the big fight coming, I was able to completely decimate the enemy with barrels and a fire bolt, even their leader with 10 to spare. Nevermind this kind of fight happens about level 3, this crushed the game’s difficulty.
Nerf the barrel placement, increase the weight, and decrease the explosion damage. One of these barrels dealt 35 damage to the boss, giving her no chance of acting before the fire field finished them off.