Use Right Arrow, Left Arrow, and Space to change the character you are drawing with. Click and drag to create rainbow trails of that character. You can also use a/d to change the character's size, s to reset the size, q/r to rotate the character, w to reset the character's direction, and most importantly: e to clear the canvas.
Here's what DX includes vs. the og project: -An actual stamping system instead of a cloning system allowing for infinite drawing parts -More customization for the character, it allows for size and rotation changing and resetting -More characters to choose from, making the whole iconic Scratch cast usable