Great but not the best, coz..
1. Make the different things between you and enemy, unit, abbilities, power ups, etc.
2. You should add more classes for this game, more classes more fun.
3. Air Battle is too hard, since there's no base, you should not only spawn air craft, but also can created space base, with new turrets and guards there.
4. The environment of battlefield should be darker, to give war feeling, dark.
5. Beach Battle for opposite of Side Beach, with base on your side, so you must defense there.
6. Air Force and Navy on the sea aren't better than other battles, too few units there.
7. Strike and Super Soldiers too powerfull, enemy should be have too.
8. All Artillery Battle sometimes lags, remove any particle effects for faster the performances.
9. Increase ammount of powered skills and upgrades, with root system, if you aren't open the top of root, you wouldn't open next branchs, so you must open all upgrades to gain maximum powers.
10. The Ending of game is not surpriseded me, maybe you should add overall statistic, highscores or somethings new.
11. Medals and Awards informations not appear when you reached it.
12. The story would be better, but please create simple and great story.
13. New music on Air and Naval Battle, it's should be better.
14. Also new graphic too.
15. and many mode too, time mode, simulation mode, custom mode, PvP mode (mouse vs keyboard), story mode, etc.
Overall Great but not the best, 9/10, It's pick up to my favorites, the sequels please.. Good Job!