I want to give it 5 stars, though I don't quite understand the gameplay. I've played idle games before, and like the idea if this one, but I can level up the immunization sooooo far above other attributes, and the game still suggests I'm at some danger level, then resets me. Constantly putting work into defense still ends up with emergency hints demanding more defense as you keep on doing as it suggests until you've already lost. Don't know if it's a bug, or something I'm missing that a guide could help with.