Feel free to copy and use. Arrow keys to move. Don't you ever feel that wall jumping is OP. I mean imagine a person doing that on a brick wall in real life. In this engine you can't climb the wall but you can bounce to get to higher places.
Other platformer engines: WALL JUMP: https://scratch.mit.edu/projects/211958643/ SIMPLE: https://scratch.mit.edu/projects/154592922/ PORTAL: https://scratch.mit.edu/projects/201906282/ ADVANCED: https://scratch.mit.edu/projects/155108778/