I like the core idea and the plague-doctor theme. Colony management tends to be one of my favorite genres and it was a lot of fun for a brief while.
This game has a great deal of potential, though I feel like there are some bugs and rebalancing issues that need to be worked out. For instance, it doesn't seem to matter much where I place my units, they will always give the same effect. I realize creating synergies is harder, but would add to the gameplay value as you force players to plan more.
Also, maybe I'm missing some key strategy, but I tried to min-max my resources and quickly discovered that it was easy to get more than enough food and gold early on. Placing a population building will always make everyone instantly sick, whereas placing plague doctors will instantly remove all but 1 sickness, rather than it being a gradual effect over time. The result seems to be that you will always game over at population 25, which is a little disappointing. Was hoping to be able to juggle it a bit longer.
The art style is nothing to write home about, though I realize not everyone is an artist and I'd much rather sacrifice that for solid gameplay than the other way around. Decent job overall for only a week. Best of luck to you.