Well, the game was nice and it was fun at the beginning. I liked the controls, and the multiple music for the missions. The graphics were also good.
What I didn't like though, is the fact that every mission is the same. Either your troops die and you destroy everything, or your troops stand there doing nothing and you destroy everything. So in the end, you have to destroy everything in every mission (which wasn't that fun later in the game).
It's a good thing that you added different kind of tanks and vehicles to choose from. Also, the upgrades are fine, but I didn't understand why you added some kind of side effects for most of them. I mean since it's an upgrade, there is no reason to add that many side effects. Some upgrades lost their value with that. You can count this as a personal opinion though; I mean, you can easily beat the game with these kind of upgrades ( I just didn't like the idea.. sorry :P ).
I hope you are not offended by this review. I finished the game, and trust me, it's better than many games I've ever played, or else, I wouldn't be writing this long review. :P
If you are planning on making EW 6 or some other game, I hope you take this into account.
GL! :3