A very unique game play and setup. However it's difficult if you have very unsteady hands and/or are color blind. Unavoidable troubles that come with making a color based mouse only game.
I managed to get 400+ on altitude. Bring the plane to the bottom of the screen and move your mouse around the side. then bring it perpendicular to the plane and bring the mouse back into the screen and release. If done right you shoot straight up.