Suggestions: 1. A sandbox more where you can make your own map and control it, by that I mean unlimited energy for zombies, you can make houses in it and summon different humans!
2. A pvp mode where you have to kill all the humans before the other player manages to kill all humans, you start with no upgrades, 5 levels on it only.
 "Mutilate-a-Doll 2"){kind=icon}
 "Incremancer"){kind=icon}