Board Thread:General Discussion/@comment-24232369-20131130052029/@comment-3153244-20131130071457

First off, get an extra farm. You have sufficient power to last you for a while, so no more windmills/watermills are needed until you run out of power.

If you're keen about MvM, you'll need more Bloontonium Generators.

A few useful upgrades:
 * Cluster Bombs (3/x Bomb)
 * Signal Flare (2/3 Mortar)
 * Triple Darts (x/3 Dart)
 * Bionic Boomer (2/3 Boomerang)

I played during the closed beta, and I found Farms very efficient to use too. To use them, you'll need to purchase the Farm upgrades building. Preferably upgrade to 2/0 or 3/0.