The bad news is I don't have a physical mouse, just a touchpad, but the good news is I was still able to make do by just leaving the cursor at the center of the stage (and honestly that probably helps in that it's one less thing to worry about lol) but I had fun with it. Played up to the ghost stage, before my finger started cramping from the touchpad button. Only thing I can suggest is maybe a brief in-game tutorial that just shows the controls and possibly something showing that you can hold to continuously fire without having to repeatedly click. I also couldn't find a way to exit the game outside of good old alt/f4.