I noticed a difference in the rules regarding placing barriers in the reserve if I play with or without the Walls Expansion.
without: place 1 barrier per type per hero
with: place 1 barrier + 3 bars per hero
If I understand everything right the Walls Expansion setup changes the game since for example in a 1p game I can now only purchase 1 barrier (since there is only 1) and upgrade it whereas I could purchase 4 of them (with strengths from 0-6) without the Walls Expansion.
I am curious if this is intended like this?! Or am I missing something?
Yes, it's a bit different.
In walls you can purchase 1 barrier + 0-3 bars.
Without walls you can purchase 1 barrier with 0 bar, 1 barrier with 1 bar, 1 barrier 2 bars or 1 barrier 3 bars.