Right and left keys - move Up key - jump Up key in midair - double jump Down key - crouch Jump into a wall - walljump Simple as that. You see that blue follow button in my profile? Click it. Do it.
Feel free to use this, just give credit to me and @griffpatch_tutor. Credit to SEGA and @FreeSoundsProject for the music and @kesda and @PeashooterPal for the double-jump engine. Just wanted to share this quickly. I've been working on it for a long time a few months ago, but then I temporarily left Scratch for a month or two. Now that I'm back, I decided to share this. I'm still working on this, so it may be unstable.