Like squares? Press space to open (or close) controls and mess about with this square. Use 'control page' to switch between multiple different pages of controls. Press 'reset' to reset the square. X and Y move the square. Squish X and Y squish the square. Rot Rotates the square around the top left. Shift X and Y shifts a side. Size is the size of the square. Thickness is the thickness of the Lines. Colour, Brightness and Saturation control the colour of the lines. Vib is how much the square vibrates. Movement is how many frames of movement it has. Move X and Y are how much it moves by each frame.
This is coded a little shoddily, the square doesn't like touching the edge.