Good.
While the game may share many things in common with the well known Crimson Warfare game, it does manage to have it's own unique identity. I rather enjoyed the game, though I could see a few pretty simple ways to improve upon it for a sequel(which I am hoping you will make).
The difficulty was so-so, and I say that with the assumption that you aren't using some of the more overpowered tactics. My favorite was buying all the stealth upgrades and then just building 3 or so airfields, loading them all up with stealth bombers. It's really quite impossible to combat from what I can see.
Everything else was very well made and polished. I personally would have liked to see a few more maps to play on for the Campaign mode, but I have little idea if that is within your power with a game such as this.
Overall, the game was fun to play, at times challenging(mainly the beginning of a level, then you would start to dominate as you raised your income), and the story wasn't stupid.
I liked it. Would have given it an 8.5 if I could. A good game, a few little things and it would have been one of the best strategy-type games I've played on here.
Make another one, imo.