In Outbreak, you will guide the spread of an aggressive virus, which attacks the host's cells, and turns them into copies of itself. Those copies then aid the spread, until all the host cells are gone. However, the host's immune system will present you with many problems, like forcefields which kill off all but the pure original virus cell, and fighter cells, which will patrol and kill virus cells on sight. You must use all your cunning and skill if you are to win.
I released a beta of Outbreak on the Google Play store around December 2016. At that point I felt that although I was happy with the game, it probably wasn't worth taking any further. The beta is still available, so feel free to give it a go!