For larger canvas and better framerate: https://turbowarp.org/803955030/fullscreen?hqpen&offscreen&size=640x360&fps=60 Click and hold to drop sand, hold space to switch to erase mode, the grain the cursor is on is erased while the space key is held.
Did this today because I am bored. If it is slow, that's a shame. thisissand this is sand note the inefficient and random usage of variables.
