Towers level up trough experience.

A tower that provides value will grow stronger. 

Even faster growth can be achieved by upgrading the tower growth rate.

Economic Scaling:

-Easy To learn, Hard to master.

-Construction progresses as income allows.

-Massive Resource sinks.

-Choose between technology progress, or additional defence.

Research upgrades

-Research pulls from your build economy, so spend wisely to survive the next wave.

-Amplify your favoritt tower growth rate or unlock additional technology.

-Choose a strategy and see how far you can get.

Advanced target priority.

Expand as the map grow.

-It gets harder.

-Access to additional resources.

-Map Generator

-Load a map from a start value.

-Small maps and very big ones.