If you want to place applet directly on Kongregate, you can use jnlp files for Java2d games or LWJGL applet loader for LWJGL games. You also have to make proper HTML code with tag. For storing game files, I recommend Dropbox. This is possible to implement, just a little tricky. ;)
Best tactic for open path levels - make long path which is as tight as possible, with 180 degrees turns, place area burst towers on corners. Place some anti-ghost towers near end. You will win all the levels except ghost ones.
Some errors/mistakes:
1. "Gahter" in game description
2. Buildings can be refilled for more than max food, especially when there are many towers and farms at various levels
3. No save file found notification is displayed even if everything is correct
4. "Grafik set" in options - it should be "Graphics set"
5. Many other spelling mistakes, like programed (should be "programmed"), form (in credits, should be "from"), build (in achievements, should be "built" as this is past form)
first of all thanks for this post my english is not so good. i will of course change the misspelling.
also i will look at this max food error.
no savefile found: its when you cancel at the begining cause then my game has no right to read or write on your computer and so he can't find an savefile.
Hope you anderstand want i mean :o
 "Deep Sea Hunter 2")
 "Anti-Idle: The Game"){kind=logo}
 "Via Sol 2")
 "Ural Truck")
 "Mad Scientist Defence")
 "Galaxies Invaded: Chapter 1")
 "Crate Incineration")
 "Smiley Showdown 2")
 "Candy Jump")
 "Mineralz Match")
 "Bubble Tanks Tower Defense 2")
 "Chromattax")
 "Mineralz Web")
 "SUPERJACK")
 "Confound"){kind=icon}
 "Galaxy Tower Defense BETA")
 "The battle of Undermountain RTS")
Yep! Just figured I should put it on Kongregate eventually.