It's shortly after the initial jump, instead of falling down into the abyss if you just keep pressing space you'll move upwards instead. The high score system doesn't seem to be working either :(
Weird, for me it doesn't seem to happen. Sadly I can't fix it now anymore anyways. For the high score system keep in mind that only climbing the ladder will save your score and dying won't, it's a risk vs reward decision where you need to "roll the dice" ;P