Virus Defence is a educative game prototype developed using the Godot Game Engine (http://www.godotengine.org/)
You can see it in action here https://www.youtube.com/watch?v=_QXGIfA50Xw&feature=youtu.be and download the executable here https://www.dropbox.com/sh/3d4elvu0rrqvt5t/AAA5xhJeYDUnN3L2dwdmwQnRa?dl=0