WWAAAAAAAATTTTTTHHHHH was it made with Unreal Engine. With my lazy reading skills I only read U.. Engine, and I was sure I used the perfect and almighty Unity Engine. It's so unreal that I kinda manage to a game with that terrible shit.
And yes the games control takes some time to learn. I can in some parts of control 4 soldiers, but the max 5 of soldiers is also too difficult for me, but I will not be shocked if some body can control 5 soldiers.