To download Light Quest from the apps store, you need a Macintosh running the latest version of Snow Leopard (10.6.6), which I currently do not have. There is a Windows version of the game, but the distribution of that version and another Macintosh version are not yet in place. When they are, I will tell you about them.
(If you are wondering why I was a beta=tester, one of the programmers and also the graphic designer for the game are close relatives of mine who grew up in Rensselaer.)
More info and links here.