This game is already good with all the custom addons, but with this mutation addons which has 200+ more mutations? Sweet! Works with all official and custom campaigns with almost no problems (so far), but the only cons I know is lacking description so I have to try one by one. Nevertheless, this is one of those must-have addons, good for playing both single and coop, highly recommended!
So good, just soooo good
Edited: October 2022
This review was posted before the latest release.