Instead of using the arrow or WASD keys to move, you must use the mouse pointer to move your character. Click and hold the right side of the screen to move right, click and hold the left side of the screen to move left. Space or up arrow to jump. Your score is the number of seconds it takes you to complete the platformer.
Thanks to RubyOnRails4Coder for the original project! Changes: Made physics more realistic (with help from https://scratch.mit.edu/projects/67727504/) Unfortunately, I had to remove the block that allows you to go backwards, but I guess you can just crash.