Oh god, this game reeks of my childhood. I remember when I first started playing flash games, and the Bot Arena series was one of the funnest things out there. To everyone talking about the controls, when this came out in '07-ish it was the king.
Guide for the Hard Badge: This is for the  map. Build a rocket on the bottom left part of the map. Focus on getting the damage to max, but upgrade the rate while you're doing so. I like to keep it at a 2:1 ratio. Upgrade damage twice, upgrade rate once. After rate and damage are at the max, build a tazer next to the rocket and upgrade the damage to the max. Build another rocket, and a cannon next to the first rocket turret. Upgrade their damage and rate to max. When you can afford to, build the cheaper damage modifier and make sure the other turrets fit inside. On the bottom right side of the map build two cannons, a tazer, and a rocket turret. Upgrade the damage to max on all of them. Build the more expensive damage modifier. Your turrets will fire more rockets than needed, and they'll easily take out any enemies.
Updated. Ill try and make the loop smoother later. Adding a score feature,hp,and a way to die and play again right...NOW. Pm me bugs and some advice please? Would love to make the game better for everyone.