This is so easy to get a high length. Just play with the gravity until you got like 20k, then just move your mouse up and down opposite to the way it is traveling. I could literally keep going until the number got too large.
That being said, make a cool game with this. I've seen one kinda like this. On the end is a weight, you hit things with it, it was fun. Do the same add something new.
Great game. Only thing is you can actually make the stats more than it shows. Not a bad thing but not a good thing either. Definitely like the whole after you beat the final division you can still play games.