Is planet studio available on mobile? If yes, how to access it?

It should be noted that while, yes, Planet Studio can be accessed via the method shown below, it is not officially supported on mobile. You may experience overheating, crashes, bugs, and there aren't really any touch controls.

lower the graphics to prevent crashing

also it doesn't save automatically

yes, go to Settings, Control, 3 Dots on the right up corner, Click "open Dev console", Type "PlanetStudio", Enjoy. Please note that Planet Studio aren't optimized for mobile devices