The biggest issue with this is in the presentation. The glowing, flashing, etc, is hostile to those with handicaps affected by such, as well as the intensive cpu needed to calculate all the rays and colors. Give some kind of option to tone it down--or even pause it, as it also makes my placement of objects extremely "jumpy" as it tries to keep up with all the effects. It's hard enough trying to place things visually ("Is that a 45 degree angle or a 40 degree angel?"), that when I add in the jumpiness, many times I end up with a delay between releasing the mouse button and it placing it--a half a second later and several dozen pixels from where I thought the mouse was.