Use the left/right arrow keys to move and up to jump. Black is ground, as well as wall, ceiling, and slopes, pink is a trampoline (hold the up arrow to bounce higher), and red sends you back to the beginning. You can press up while touching a wall to perform a wall jump. If you fall all the way to the bottom, you have to start over. Touch the checkered flag at the end to win. There's a glitch that prevents you from jumping sometimes, so if this occurs, press r to fix it. Now comes with an animated pixelated turtle man.
This code is built off of my first scroller platformer test and may be used in upcoming projects. Link to the original project: https://scratch.mit.edu/projects/992339759