Fire Wall still stacks, they just fixed the issue that made the stacking deal increased damage.
- Fixed an issue where overlapping Fire Wall or Blaze missiles could cause increased damage
Here’s a video I just made, you can see that the additional Fire Walls past the first increase the damage rate and then decreases as they expire.
The only modifications I did was change the zombies AI to idle so that it doesn’t move and increased its life regen so I didn’t have to wait as long for it to heal between Fire Walls (monsters don’t regen in Fire Wall since it does damage every frame, they don’t heal in any frame that they take damage).
I agree with Johnson though, asking them to “unfix” a bug isn’t the way to go and they’ll never do that. Just ask them to increase the damage instead, that’s much simpler.