I'm not sure what to make of the game atm ... it's an interesting concept for a TD game and enjoyable too. But really simple - the man really isn't needed after day 6 or 7 ... then the game just becomes boring and repetitive.
Makes sense for the machine guns to be AA and anti-ground, but that would make the game a lot easier ... and that's just not needed.
After Day 25 (at least for me), I was only spending Valor on repairs ... 4 repairmen, 4 heavy infantry, 10 gunners / 2 machine guns, 2 mortars (on opposing corners).
Great game - but the only issue I have with it, is when I get a crit hit or a master hit, no damage is dealt (but this happens very rarely). Don't know if that's a bug or something, but its rather annoying.
If you actually make it all the way through the game - you'll realize there's a decent storyline ending with the promise of a sequel (hopefully the sequel won't be as boring as this game was).
 "The Next Floor")
 "The Last Frontier")
 "GeoSketch")
 "UPGRADE COMPLETE!")
 "Little Wheel")
 "Learn to Fly")
 "Morningstar"){kind=icon}
 "faze")
 "Hero's Arms")
 "Fantasy Kommander")
 "The Great Siege"){kind=logo}
 "Orbital Decay")
 "Planet Defender")
 "Spellblazer"){kind=icon}
 "Temple Guardian 2")