Could have been better.
Quite frankly i am disappointed at it. Not only is it exactly the same as the other 3, its even worse. The enemy AI don't even notice you're there until you are almost directly in front of them and they have no objection to kill their teammates. I mean you could have at least added a mechanic to let them know that there ally is in front of you so they won't shoot.You added like3 new weapons,no new sidearms or grenades, the ally AI are still dumber than a rock, and you have to guide them to where you want to go, or else they'll just run into a wall.
You had less maps, and they weren't even that fun. You had three campaigns with 4 missions each, each mission had 3 maps, yes thats 36 maps, but 36 not that good maps. Basically to me it seems like you just redid Endless War 3 except it was worse, had 3 new main weapons, and three campaigns that weren't even that good. I think you should redo the entire thing, Make the AI more smart like have the enemies and allies know to not shoot when there is their own teammate in front of them, have more melee weapons, have more sidearms and more grenades, you could also make the maps more diverse so they aren't the same things over and over again.
Instead of being a generic person each mission, you should be able to make a custom character to play the missions with, make the guns moddable or upgradeable.