If you are refering to the Any% glitch, then you might do it wrong. To perform this glitch, beat the first level, wait about 3 seconds, open and close the upgrade menu, and then quickly hit the continue button EXACTLY 8 TIMES right after it appears, then wait. In a few seconds the victory screen should appear. If you click less than 8 times, the game'll freeze, and when you refresh you'll be on another level. If you click more than 8 times, the game will glitch out. If you don't click fast enough, the game'll freeze, and when you refresh you'll be on level 9. TheAlphaMudkip was the one who discovered this glitch. Here's a video he made explaining it:

I recommend continuing to watch the videos on the leaderboard and continue to try. Sometimes it works for me and sometimes not. I don't know exactly what determines if it works or not, but I try to stay as far as possible on the edge on the ground, and when I jump out towards the lava, I try to jump as short out from the ground, but as far to the right as I can, so after the two double jumps you have come as far to the other side as possible. If you are successful, you will see some glitched hearts on your screen when you are hitting Darth Vader. Me doing it: Not the best quality, but it shouldn't be a problem to see. Time in video: 6:45