I have to ask, are the two players stats (move speed/weight) ever so slightly different? I swear the pink one was always heavier/slower. It could be browser lag, or the time between processing one vs. the other, but I swear the pink one always felt sluggish. I'd find on certain levels the order made certain jumps easier if I changed the order of who went where..
Other than that, loved the game! Would totally play more levels!