A Tower Defense Game

This is an unbalanced tower defense game in early development. Its made by only one person and its not so good. It has only ~20 rounds, so you need to reset the game to try other towers. I know that there are some bugs, but i hope that they will not disturb you. Also feel free to suggest other background music if you dont like it and please tell me what would i change to make the game more balanced. Useful buttons: Pressing digit 0 Restarts the game, Pressing digit 1 gives you 100,000$. There ar...