Please, take my advice and this game would b GREAT
Read the review below mine, listen to him. And now listen to me.
The menu system needs an overhaul, the enemy was constantly producing enemies and coridinating its forces faster than I could navigate my menu, the end result being that my line was usually pushed back while I was upgrading and monitering money and cooldowns, either slow the AI down, or build a more tangible menu.
Aside from that, it was excellent. Keep up the good work :).