Concept, Needs Refining

hello.

I was thinking about making a game, and had an idea. Basically, you start as something along the lines of a ray of light, and you have to reach another portal, at the other isde of the level. Then, you have to use tools such as mirrors, prisms, etc. to negoiate the obstacles and get through. I immediately thought it would be a good idea, but when I tried to get some concept on paper, it didn’t seem so great. Can anybody help me refine the general idea, I mean, the plot doesn’t seem to be working, as it’s hard to find any reason for a ray of light to be dimension-hopping…