I find that omnivores are the most deadliest creatures in the game, why? they can survive in many different environments, and in there late stage they can eat anything.
make a vampire power, which will turn the alive item it hits into a vampire, and any other alive item it hits will become a vampire, and they will have no blood, and can only be killed by a wooden item.
my ecosystem was weird, it contained herbivores and virus, what happened was that all the herbivores would eat the plants, and once they were low, the virus would spread like crazy, but once the herbivores died out, and only a couple were left, the virus would get low, and the herbivores would thrive.
for a new virus idea, i feel like the virus would cling on to a already living cell, and would drain the cells mass, with the virus taking more and more mass as it grew, and when its not eating a cell, its floating around, not controlling were it went untill it hit another cell.
for the virus power, i fell like the virus will spread faster with alive items with open wounds, and i feel like it should have a percent of infected on the alive item.
TTheres a bug where they keep falling and getting up and you cant hurt them, they cant move, and it annoys the crap outta you cuase it plays the sound to.
I got a cool idea, maybe for zombies, all you would do is if it touched them, they would turn green and infect. And also, maybe make the dolls be able to decompose, now all you would do, is if they died, they would disentigrate over time, part by part.