Couple things that I would find tremendously awesome.
1 - the purge right now only throws the same type of enemies at us. I know its supposed to rotate through different enemy types. It would be awesome if this was resolved, and would be huge.
2 - the purge bringing in siege equipment. If we have walls, that the purge brings catapults and explosive jars and uses them. Right now, at least in my experience, they just beat on the walls with their weapons. Make the equipment choice on the purge match the need.
3 - that there be areas on the map walled off that the players need siege equipment to break into. All of the inhabitants live in areas that have no real walls or gates. There are a myriad of ways to get in. I’d like to see a couple of really tight secure areas that you need explosives and catapults to breach.