This is challenging, intuitive, and extremely enjoyable. It's a very fun RTS that I can't find fault with, and it's a very good base for an even larger game.
The control feels more like a suggestion, and that is very good as you have to carefully guide the infected around the dangerous area. The way all entities wander around gives life to them, and it's so fun playing all the levels that are offered.
I am very impressed by this game, honestly. Absolutely well done, man!