All upgrades are free.
Shooting gives you ammo.
This game has the best artificial intelligence for an action packed flash game. You will witness enemies hide behind cover, strafe, pick up weapons, jump from cover when you are on their flank, they wont see you through walls. Advanced Combat. Enjoy. It took 2 years to make.
Setup controls in the main menu.
Options>click controls. Check out controls. In game you can press ESC to see your controls aswell.