Tip to get to level 100: go to the under water dungeon and replay the 2nd mission. It is super easy if you have the sword of swordlyness and it gives tons of EXP.
One of my favorite flash games. An idea for a sequel could possible be microbe chain wars where you play against other chains. I would be stuck playing that for at least 3 hrs. Also, the addition of a chain-deleter bonus would be very helpful. My final suggestion is a bit complicated. Okay so there is a circle much like the one in the current game. For the first half of the game you start it with a little peg the you must protect. The end of your tail is attached to said peg. If a microbe hits it you go on to play this exact game. Well that's my 2 cents.
Awesome game. A good tip is to ignore the back cars. if the front car makes it the rest of the automaticaly do. 6/5. Needs some badges and it would be one of the best games on kong.