Use WASD, Space, and Shift to move around.
Use E to change your matrix.
If your computer struggles to run the program, press Escape and drag the slider down to draw fewer points.
R resets the points to their original positions.
Left Click Applies the transformation to the points.
Right Click returns the points to their original positions (like a transformation, not an instant reset).

For an explanation, visit https://youtu.be/swmN2nc812U