I had a bit more time left over of the project, so I have been tweaking the level to reduce the light bleeding, because I figured out what was causing it; there were small holes that are impossible to see without being up close to them. I was unsuccessful in stopping the light bleeding, however I did improve upon it.
Another tweak has also been added and that is a new material has been made for some surfaces:
In the screenshot above, you can see passageways have a new material attached. The material is created by using the original material and adding a new texture to it. The material is attached to the floor underwater, so it has a swimming pool feel to it.
Game Growth 