Innovative, but that's the only good quality
I really love the idea of being the attackers for a change, and I enjoyed this game for awhile, but it mainly consisted of a bit of small math for bulk buy, holding down F1 for a minute, then watching the 3FPS madness. There is a lot of potential in the idea, you just need to flesh it out with making spending gold on upgrade worth it, like making units not take one-hit-kills.