I'm aware there's problems, I made a mistake and overwritten some UI files in the android version and had to rework the UI from scratch at the last moment. I'm sorry for this. I've tested it and it seems the only thing you can't do it's to go back to the main menu, you can go back to the game from the save menu touching the "return" button on the top right (I know the font color it's too dark), you can go to the main menu just by closing and opening the game again.
Everything will be fixed in the next chapter (Chapter 4 is gonna get released way faster than usual), I'm already working on a new UI and in a better android exclusive UI.
I've priced the android version way lower because I couldn't deliver a quality version but that will change next update. Again, sorry for the inconvienence.