Computer cheats...
It's clear that by equipping a strong turret , using very few units only to defend close to your base and using the "special" often you give the opponent no chance to build up money or experience.
However despite that the computer continues to push units and evolve. Apparently the computer plays a different game from you, making playing strategically useless.
Also it's pretty impossible to win in the early stages of the game, so you're forced to go through the whole evolution thing. Defense is overpowered.
I like the idea a lot but there are some flaws that prevented me from enjoying this game fully.