I'm working on a game with procedurally generated planets and this is a perfect fit. My own code for randomized planet textures just proved that I'm absolutely terrible with anything related to visuals, and I'm more than happy to let it go for this.
Honestly, it's amazing how much these shaders are capable of. I've spent the entire weekend working on code that randomizes all the parameters and got so much more out of it than even what the demo app is showcasing (which is already a lot). At this point, just flying around the galaxy and looking at all the planets might end up being more fun than actually playing the game. xD
Only small thing I noticed is that when you set the crater size to be very small on lava worlds and "no atmosphere" worlds, they tend to line up like the stripes on a watermelon and it looks fairly out of place.