if I were to guess, I'd say that there is something wrong with the scope of..
_root.game.player.gotoAndPlay("fall");
Depending on where that actual code is located, you might not have to go all the way back to root to reference it. Also, instead of having 800 OR statements, you can run a loop and check, like so.
make a variabled named numberOfPlatforms and set it to how many you have in total, then run this code.
onClipEvent(enterFrame){
for(i = 0; i < numberOfPlatforms; i++){
if(this.hitTest(_root["clif"+i]){
//play code
}
}
}