Tips are:
- Use your special as often as possible. It clears out enemies and gives a nice influx of cash to build
- Evolve as soon as you can to stay ahead of the enemy (it's usually just a short string of warriors before they level too)
- Max out your turret spots (4) and fill them with the Ion cannons of the last age, once you do, you wont be at any risk of being attacked at the base so you can just let the money roll in.
- Supersoldiers - the enemy cant build them so they are your golden ticket - I built a tank to take the brunt of the enemy ion cannon until it got close, then two SSs behind him. Used my special (laser satellite) to clear most of the path for the approach.