Oh and I must add: I've noticed some comments saying the game gets laggy after 30+ units but I haven't experienced that issue. I've reached lag, but its only in the later stage with 120+ units (total) on the screen. Lowering the quality helps, smoother gameplay but not too physically noticable.
So sad. I played from the 1st mission to 11 and then my screen went black when I got sidetracked and looked for another game in the search bar. Didn't save at all and lost three hours of progress lol