Click see inside to see the code. I just realized the mouse trail looks like Scratch Team's mouse trail tutorial, but no, I didn't follow their tutorial. I just made scripts that I thought would make a simple mouse trail. Instructions: Just move your mouse around and see the eyeball point at it within the block and mouse down for a faster clone speed (easier to observe the BAD physics).
v1.0 - 3 sprites, body, mouse, and eyeball v1.1 - 2 sprites, body and mouse (eyeball is a clone) v1.2 - added more things like more mouse trail costume, different particle system, and a background