It's not really that different from the base game if you're used to playing aggressively. Stealth players will be in for a bad time, though.

I find the concept of the scenario pretty good. However, I find that it is still easy. On Normal difficulty, I am still able to win (by wiping out all of humanity) with 2 stars without ever actively fighting the vaccine, immunity etc. I understand a lot of work went into the scenario and am just hoping to provide some constructive criticism.
Huge fan of your work, keep it up!