WASD to move camera. E and Q to zoom camera. Space to restart simulation. Click (toggle) to open settings and debug menu. (Please, credit me if you want to use this.) dx and dy: direction towards a specific position distance (dist): the "length" you could say, to the ⠀⠀⠀position. velocity: same as speed, inclusion of direction. force: changes velocity. mass: a property which, makes an object harder to push and pull.
