Good job on making an interesting vertical platformer, because I haven't seen one in ages lol. The physics and barriers are very well done, and the moving up mechanic is just beautiful. Very neat coding.
One thing I would recommend making is some rewards to the player when they take the risk. For now, it seems like as long as I play slow and steady, I will have a higher chance to win. I believe that this game is more exciting in a faster pace!