fun game, sadly, there were a few scaleing problems for ui and upgraded towers, also the game freezed few times 

This seems like the start of what could be a cool tower defense, but I had some trouble with the game's size. First, there was no fullscreen button, so I had to zoom out my browser window just to fit the whole game on screen. Then I found that even at the default zoom level, the buttons to sell or upgrade your towers are absolutely tiny and impossible to see.