You should get 100% gold back from selling towers as long as you have not started the waves yet, so you can more easily set your initial units up without losing gold.
I REALLY wanna see my units change a little every time the level up or I upgrade them. Like maybe a differant cuirass there, and cooler helmet there, and a better looking weapon for the attack upgrades there, you know? But still, this is my kinda game. 5/5!
You should TOTALLY make an off-road free-roam track and an off road car(s). I have the craving to just bounce around the beautiful countryside in a dune buggy or something ^_^.(weeee!)
How in the world do you exit a screen when you are like buying upgrades and stuff for your car? This my just be because its not showing all of the game screen on my comp, because i have a laptop and ive heard that is a problem, but it doesnt seam like that. So just asking :)
Why cant i just buy a bunch of pingu balloons? Then i fly away XD Then i disconnect from them at a really high altitude and fly straight in the iceberg, split it straight down the middle like a stealth bomber! XD