I rank this up there with Toss the Turtle.
And that's saying something, cuz I freaking loved that game.
Well done. I might have a little bit more advancement close to the beginning, and then also have *uber* upgrades that were a couple hundred million each. Like, a 3x air strike, or 400 power.
Overall, I loved this game. I especially liked that you could click your way to a better score, not just hope you ran across some ammo or some other completely random happenstance.