Rate my progress in the game, and you talk me how to improve

Rate my progress in the game, and you talk me where I can improve.

http://www.newgrounds.com/portal/view/680396?updated=1472616322

http://sielxm3d.co.nf/games/scholar-tower-defense.html

Hey guys, what you think about my game? where i can to improve it?

There is an error on the newground site. If you fix this i will try your game.

Sorry, the link on the newgrounds is this one:

http://www.newgrounds.com/portal/view/681090

I like the idea but I get a massive framerate drop when new kernels are spawning in the pan. It makes it really hard to play properly.