great game.
here are some thoughts. first of all, after you hit your first 250000 the game doesn't get any harder. if you have even one of the 3rd level auto defenses they will mow down just about anything. and once you have 20-30 on the com, you can be clicking strikes before their guys can even come in. and 40-50 com is just constant clicks :)
so i think it would be great if you added one more level enemy. or even two. because once you hit that 250000 mark there isn't any incentive to get the rest of the items (which i did get, however) since it isn't difficult to reach them, and therefore not rewarding to. i think there should also bea cap on the com units. perhaps only 30. anything more is kind of ridiculous. i think airstrikes should also cost money as you use them. perhaps even a lot of money. like 20-50k or something. that way you can't just be clicking, but you could still use 4-5 per round.
another thing, after about 20 com employees, my com bar stopped working, it wouldn't grow anymore, although i could still use strikes. i just had to guess when the bar was full.
also, if i'm in low quality mode (since my 700mhz can't play the game normal... or even in low, really) and i finish a level, the store screen's text is all wonky. some of it doesn't show, although if i go to medium quality, or high, it shows up. perhaps you could look into this?