Had its moments but altogether too easy
It was fun for a bit, and some levels were a bit tricky until you got going, but once you did it was just a matter of waiting until you overwhelmed them. The last "endurance" level for instance. In the end every tower was fully upgraded but the enemy side had:
1 Great Pyramid, 1 Pyramid, 1 Bubble Dome, 1 Standing Dome, 1 Spider Factory, 1 Dark Hut, and 1 Stack Plant
against what I had:
5 Tank Factories, 4 Radio Towers, 2 Great Pyramids, 3 Green Smoke Plants, 1 Blue Smoke Plant, 1 Dark Hut, 1 Pyramid, 1 Bubble Dome, and 1 Spider Factory
I actaully went off and had dinner leaving this game going only to come back and see that I still hadn't taken even 1 damage. Not exactly much of an endurance challenge when there is no increase in difficulty after a point.