Currently thing have only been tested and working on a 7″ or larger screen, specifically the Nexus 7. It is possible to change the resolution and dpi for things to fit on smaller screens, but may it may not work without some tweaking.
I’m working on improving this, but it’s going to take a while still.
I have the chalkboard electronics screen, and while the screen is nice, it has a plastic overlay that has peeled up and made things quite ugly. I’m not sure if it was the sun, or temperature, or what, but I’m not happy with that portion of it.