This game is great. The enemies are well thought out, the upgrades are good, and the support of extra troops help smooth out a rough difficulty. I also like how you can control a vehicle temporarily so that you can not only get through enemies quickly, but also cover more ground. Also the selection of guns (mine being the shotgun) give you a range of tactics.
That being said, I wish you could control your soldiers better, rather than just be in a flying V formation, so that they can avoid being hit. Also, I think that the leader shouldn't be hit with a barrage of attacks so easily. I mean, his health takes a nosedive when hit by three bullets at once. Give him some slight invulnerability whenever he's hit so that he doesn't die too quickly. And sometimes the sounds drops for no reason, though this can be fixed by clicking the sound off/on button twice. Lastly, I wish that you could do more than three objectives at a time; it'd be one thing if you only had to do a total of forty, but for a hundred, seems a little...extreme.
I apologize for sounding like a whiner, I just like this game and wanted to point out some things that could be improved upon in your next game. So nice job; keep up the good work.