I made the eyes, head and body in different costumes, and it creates clones so that you see this. –(More detailed explanation inside the project.)– I recommend fullscreen. You can see how fast the code runs by seeing which parts are blinking when you click the flag. If only the bottom blinks, then it is running quite quickly. If the upper part blinks, then it is running a bit slow. If also the eyes blink, then it is sooo sloowwww.
I made everything with scratch tools. Inspiration: https://scratch.mit.edu/projects/1029016700
