Use the arrow keys to move your player and avoid lava and spikes. You can skip a level by pressing s, but there are 12 levels and you only have 2 skips. Boss link: https://scratch.mit.edu/projects/690124535
Level 12 is the hardest. Even I usually can't beat it and I'm the one who made the game. This is not a regular platformer. You only have 3 lives, so if you die 3 times, it is game over, and you have to restart the whole game to keep going.