Continued working on the game. I'll release a new version after the contest is over (in 10 days).

I added more mob and minion types: villagers, pest doctors, wolves, minion beasts and skeletons.
The disease wont continue to spread anymore, instead you'll have to construct your own towers to capture the lands by sacrificing minions.
You can order your minion army to guard a certain place or follow you.
Mobs wont die in the spreading disease, but will slow down.
You gain much faster health within diseased lands.
Villagers run away from you.
Pest doctors cure the lands, and are very strong.
Last but not least I zoomed in the view so it is a bit more clear what you're looking at.

Here are some screenshots: