It's an interesting game.
This is from the flash submission page:
"If this is a preview, trailer or demo of an unfinished project, please submit it to NG ALPHAS! Users often don't take kindly to unfinished work in the Portal. "
Don't submit demos here. It's pissing annoying to play a get filled with "only in full versions."
And this game is definitely not worth $15 American. Even if it is easy to understand the interface, you should have still put in a tutorial.
Oh, and as silly as this is, the game needed for flashiness. Nothing really looked THAT impressive, and in this day and age, image is important. REALLY important.
The attacks also, look kind of weird. For example, my game, the upper left player would send a direct attack of infantry to the upper right player. So the little men would scoot over in their dingy and run to the city to shoot it. But they way they'd move looked so weird and unnatural.
More dynamic camera angles would have definately made this game worth the money. For instance, when someone prepared attacks another city by dropping a normal warhead on them with a plane. Have (with the option to skip or disable the cutscenes, so as not to annoy players not wanting the feature.) the camera change to a sort of 3rd person to the plane and follow it to the bomb site.
Well, I hope you consider my suggestions. It is a good game, just.... not good enough to pay for yet.