I enjoyed playing this! The weight distribution mechanic prevented this game from being just another "catch" game, even though it was implemented in a simple way. For a game of this scale I don't have many complaints--the visuals were simple, yet appealing and informative; and the gameplay was simple and fun--but two problems are the lack of instructions, and slowdown.
I know the instructions are in the comments, but it would have been nice to see them in-game. Even a bit of text on the home screen would have been a great help. Without knowing the instructions, the in-game balance bar (as helpful as it is) doesn't mean anything. (I'm aware I have been guilty of this same oversight, but that's why I'm pointing it out; I have since realized how much this impacts a game.)
The game also suffers from slowdown once a few dozen ladders are stacked, which didn't surprise me since having lots of elements in a Flash game usually results in sluggishness, and you probably wanted to keep the stacked ladders around to keep their impact on the balance. But next time you deal with something like this, try thinking of some kind of workaround that lets you remove offscreen items so as to speed the game back up.