Metroid: Father Hunt

[Chris2Balls [:B]]

I think your idea could work on a higher resolution, but as it is now you may encounter readability problems, as it's quite discreet but makes the situation more visually complex.
I don't know if you've played the first Metroid, but the missile door shares the same green as Samus; when you switch the missiles on, Samus changes colour but so does the door! What's interesting in that example is the way you can understand the situation rather easily through the interaction between the door and Samus.
As for the dots, why not integrate them directly into the door's design?