In recent years, the tower rush genre has seen an explosion of creativity, fundamentally altering how matches are played.

Modern updates have introduced complex, multi-layered abilities that require split-second timing and deep tactical understanding.
Controllable Units
For years, every unit in the game was a 'fire and forget' missile; once deployed, the AI took complete control.

It shifted the focus slightly away from pure macro-level resource management and heavily toward micro-level unit control.
It ruins perfect defensive geometry.It is a lifesaver.Champions often define the entire meta. Evolving the Meta
Another massive recent innovation is the concept of 'Card Evolutions', where standard units gain new powers after being played multiple times.

You must know exactly when the opponent is holding an Evolved unit, as treating it like the standard version will result in a lost tower.
Game UpdateThe RulesEvolved UnitsPlay a specific card X number of times to unlock a supercharged version for the next deploymentCustom DefensesPlayers can now swap the default Princess on the tower with different characters that shoot faster, slower, or deal splash damage What Will They Think of Next?
While controversial among some purists, these changes are absolutely vital for maintaining a massive, engaged player base.

The players who adapt the fastest are the ones who conquer the leaderboards.