It's a tech demo!
The "F" key to switch to full screen is nevertheless hazardous.
It is however quite a shame that the skybox is not available. In the engine folder, I see the possibility of having light too! Why is such not implemented?
The canyon image at a color depth of 48 ... =o
And water4096 to 24. But do you know that if you are looking to optimize, it would be good to change this by keeping only certain colors. It won't impact the detailing if you do it right and then save space. After that I don't know exactly what you are trying to search and / or demonstrate.