Mouse dont use normal coordinate.
0 is the center of the screen game
-1 for left, 1 for right
-1 for down, 1 for up
if you want to use pixel coordinate of game screen, you can use :
camera: Sup.Camera;
awake() {
this.camera = Sup.getActor("Camera").camera;
}
update() {
let mouse = Sup.Input.getMousePosition().unproject(this.camera);
}