Nicely done take on the form. The original game of this type was a Japanese Java applet known as "Falling sand game". I'm not sure it's preserved anywhere though.
https://en.wikipedia.org/wiki/Falling-sand_game
I'm pretty sure I played a similar game in like '95. It was called Logo. It had a turtle, and you could use the turtle (and your imagination) to draw pretty things on the screen. You probably played it too.