One tiny litttle detail that could have made a bit of a difference, i found the bullets for both myself and the enemies to be a little confusing at times, (especially once the rebounding bullets are introduced) something as simple as changing the color of one teams bullets could greatly aid in the dodging aspect of the game.
A little advice for people new to this game. Build a solid defense of around 10 guys or so before doing any upgrading. The first five or so rounds arent a problem at all for conscript units, which is long enough to get a good, solid defense, then start upgraing, and soon you'll have more money than you can spend on upgrades, use this towards paving certain tiles in strategic locations and building elite units on them.
Are people honestly to stupid to know which track is which. First of all, they are in order on the badges. Secondly, they tell you, (first two, secound two, third two). And third, they describe what the track looks likeon each check-box. C`mon people, you cant be so dense as to not stop and think for a minute and figure it out insted of complaning in the comments.
For everyone complaining about the Strong Tower level, its really not that hard when you take it logically. I got gold on my third try on it. All you need to do is instead of shooting randomly hoping you'll win, you need to aim for the partly exposed part of the box with the woman in it. (and i'm sure you're fellow kongregate-ers woudnt mind if you voted up this helpful information.)
*TIP* The best way to deal with giant trolls is to just ignore them. They take away the same amount of your 'health bar' as a normal unit, but if confronted they will kill many, many of your units. + so others can see.