Mouse pointer = pen. Press and hold e to enable dot pen. Press and hold d to enable line pen. a to make pen size bigger, hold to form circle pattern, and space to reset pen size, z to rage quit. and q to erase everything, and the only reason I put these controls was because you use the mouse. :c)
I was going to add rainbow letters and press the red stop button to quit, but extra extensions from Turbowarp don't load in scratch. I used Turbowarp just for the sprite. Yep, I used pounce bounce isle, because I like it.