I thoroughly enjoyed the closed Alpha, however, 1 major concern I have is the unit overlay.
It was extremely hard on the eyes. It starts off as a full bar of blue and each unit you lose, it has a red hit bar counter. Each hit my units took, if I looked at the bar, it was very hard on the eyes, almost like a 3D effect. I eventually stopped looking at my bar due to this reason. The red side (enemy) is fine on the eyes, it was red/white.