You will drop any other tower defense game once you try this one. Apart from looking great, it's tons of fun. Levels range smoothly from trivial to impossible to beat. You have everything you need to win, but you will hardly resist the add-ons.
After humanity's demise, you will lead the good robots to reclaim Earth. Turn based fun where you control just one robot with 3 attack categories to bring down the enemy; summon other automated robot minions, energy hacks and direct attacks.