This game is crap. No offense to the author, it was a good idea, it was just done in a VERY poor way. Not only does the game feel extremely choppy when looking around (consider changing edge movement to WSAD) but also I found myself repeatedly selecting groups of tanks again. As I was trying to click on buildings near the edge of the map they would de-select themselves.
The upgrades aren't explanatory at all so you have to take random guesses as to if you're buying something that's crap or not.
I found that later in the game, when the maps get larger, that it was a pain in the ass going back and forth to my bases to select my tanks then back to the base that I wanted to attack. GIVE ME A DAMNED SELECT ALL KEY.
tldr; More descriptions for upgrades, rework how you look around and attack, SELECT ALL TROOPS KEY