Double click the green flag! Use arrow keys or WASD to move. Hold down to crouch. Don't touch spikes or lava (the grey thing that goes up and down).
Yes this is CoSc19's and all that stuff, this is their platformer, but the prologue, it's the same thing, but the opposite if that makes sense. The Prologue. Here is the other project https://scratch.mit.edu/projects/526535293