Press space to have it move around.
Oh and the FILLing isn't good, thus why I want SVG-type filling, AKA BEGIN-FILL and END-FILL, as opposed to FLOODFILL.
I get an undefined custom block error:
About floodfill vs. polygon fill: Ideally we'd have both. Sometimes you know in advance that you want to draw a filled shape, but sometimes you have lots of overlapping lines and the regions of the resulting picture emerge from lines all drawn at different times:
POSITION is only in 8dev.
I remade this here (I don't know how to make it so you can see the code of it, so...)