I hate point and click games. This one was particularly horrible to me. I won't rate it because I hate the genre as a whole, but I imaging if I didn't I would still rate this game poorly.
I have been maxed out for quite a while. My tips for everyone. 3 atom bombs for clearing waves. 2-3 support calls for the bosses. Cabin positioned at the bottom left so bosses don't 1hko you.
It took me until danger level 66, but I found a bug. Short on cash? After you kill the boss of any level you must click the check mark to continue. If you click it more than once you gain the reward money more than once. Game = Broken. Your welcome. (It's possible that you don't receive the bonus money until you have all upgrades. I'm not 100% sure).
Max levels. Weapons:20 Shields: 10 Fuel: 10 Support: 3 Bomb: 2 Grabber: 3 Repair: 1 ---- I am on danger level 35. These seem to be the level caps for each part.
Walks by a Hmmwv (Hum-v) Highly mobility multipurpose wheeled vehicle) and sees a 50 calibur m2 machine gun mounted on the top of it. "Nah not worth checkin out." Digs through trash can for items.