How do I use the mouseup event to control a game in JavaScript?

Question

I'm trying to make a game in HTML5 canvas. For this, I created this control module with this function that adds listeners for keyboard and mouse inputs. However, the mouseup event is not working/working as expected. When clicking with the mouse, the object starts moving, but when releasing the mouse, the object does not stop.

Sorry for not posting a fiddle. The complete project is here: Github and the working version is here: Github Pages.

export let
goLeft = false,
goRight = false,
doShoot = false;

export function addEventListeners() {
    // Adds listeners for the keys.

    //  On press:
    addEventListener('keydown', ({code}) => {
        switch (code) {
            case 'Numpad4': goLeft = true; break;
            case 'Numpad6': goRight = true; break;
            case 'Space': doShoot = true; break;
        }
    });

    //  On release:
    addEventListener('keyup', ({code}) => {
        switch (code) {
            case 'Numpad4': goLeft = false; break;
            case 'Numpad6': goRight = false; break;
            case 'Space': doShoot = false; break;
        }
    });

    // Adds listeners for the mouse:
    
    //  On press (right or left side of the canvas):
    canvas.addEventListener('mousedown', ({offsetX}) => {
        (offsetX < canvas.width / 2) ? goLeft = true : goRight = true;
    });
    
    //  On release (any place the canvas):
    canvas.addEventListener('mouseup', () => {
        goLeft = goRight = false;
    });
}