You have some serious issues to take care of.
1. Spelling Errors.
Way to many to count. You should definately get someone to proofread your work before you submit it. It definately took away any feelings of professionalism in the game and should be taken care of.
2. Bugs.
Can't build buildings when you have the money for it.
3. Gameplay.
Boring gets really repetive. Last level was way to easy, and way to long. The second level was nearly impossible with the bugs and the first level dragged on for what felt like eternity. The third level was the only level that was really worth playing.
Sorry to say it, but this is a bad knock-off of some of the better defense games on newgrounds. If you truely want a top 50 game, then polish the game before you release it.
Overall: 2/5
-Jose-